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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">vestifm</journal-id><journal-title-group><journal-title xml:lang="ru">Известия Национальной академии наук Беларуси. Серия физико-математических наук</journal-title><trans-title-group xml:lang="en"><trans-title>Proceedings of the National Academy of Sciences of Belarus. Physics and Mathematics Series</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1561-2430</issn><issn pub-type="epub">2524-2415</issn><publisher><publisher-name>The Republican Unitary Enterprise Publishing House "Belaruskaya Navuka"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.29235/1561-2430-2026-62-3-183-192</article-id><article-id custom-type="elpub" pub-id-type="custom">vestifm-914</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>МАТЕМАТИКА</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>MATHEMATICS</subject></subj-group></article-categories><title-group><article-title>Произведения конечных групп с условиями формационной субнормальности на подгруппы факторов</article-title><trans-title-group xml:lang="en"><trans-title>Products of finite groups with conditions of formation subnormality on subgroups of factors</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Балычев</surname><given-names>С. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Balychev</surname><given-names>S. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Балычев Сергей Владимирович – инженер-программист подготовительных курсов института повышения квалификации и переподготовки</p><p>ул. Советская, 104, 246028, Гомель</p></bio><bio xml:lang="en"><p>Sergey V. Balychev – Software Engineer at the Preparatory Courses of the Institute of Advanced Trai ning and Retraining</p><p>104, Sovetskaya Str., 246028, Gomel</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0769-2519</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Мурашко</surname><given-names>В. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Murashka</surname><given-names>V. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Мурашко Вячеслав Игоревич – кандидат физико-математических наук, доцент, доцент кафедры алгеб ры и геометрии, ведущий научный сотрудник НИС</p><p>ул. Советская, 104, 246028, Гомель</p></bio><bio xml:lang="en"><p>Viachaslau I. Murashka – Ph. D. (Physics and Mathematics), Associate Professor, Associate Professor of the Department of Algebra and Geometry, Leading Researcher of Research Sector</p><p>104, Sovetskaya Str., 246028, Gomel</p></bio><email xlink:type="simple">mvimath@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Гомельский государственный университет имени Франциска Скорины</institution><country>Беларусь</country></aff><aff xml:lang="en"><institution>Francisk Skorina Gomel State University</institution><country>Belarus</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2026</year></pub-date><pub-date pub-type="epub"><day>29</day><month>09</month><year>2026</year></pub-date><volume>62</volume><issue>3</issue><fpage>183</fpage><lpage>192</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Балычев С.В., Мурашко В.И., 2026</copyright-statement><copyright-year>2026</copyright-year><copyright-holder xml:lang="ru">Балычев С.В., Мурашко В.И.</copyright-holder><copyright-holder xml:lang="en">Balychev S.V., Murashka V.I.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://vestifm.belnauka.by/jour/article/view/914">https://vestifm.belnauka.by/jour/article/view/914</self-uri><abstract><p>Установлена связь между решением проблемы Шеметкова о Z-насыщенных формациях и изучением классов групп, определяемых системами формационно субнормальных подгрупп. Найден критерий разрешимой (насыщенности сверхрадикальной формации. Доказана сверхрадикальность наследственных S-формаций. Описаны все наследственные формации разрешимых групп F, содержащие всякую группу, представленную в произведение своих подгрупп, все H-подгруппы которых F-субнормальны (K-F-субнормальны), где H – насыщенный гомоморф.</p></abstract><trans-abstract xml:lang="en"><p>The connection between the solution of Shemetkov’s problem on Z-saturated formations and the study of classes of groups defined by systems of formation subnormal subgroups was established. A criterion for a superradical formation to be solvably saturated was found. The superradicality of hereditary S -formations was proved. All hereditary formations F of solvable groups that contain every group representable as a product of its subgroups, all H-subgroups of which are F-subnormal (or K-F-subnormal), where H is a saturated homomorph, were described.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>конечная группа</kwd><kwd>сверхрадикальная формация</kwd><kwd>Z-насыщенная формация</kwd><kwd>S-формация</kwd><kwd>мультифакторизуемая группа</kwd><kwd>F-субнормальная подгруппа</kwd><kwd>K-F-субнормальная подгруппа</kwd></kwd-group><kwd-group xml:lang="en"><kwd>finite group</kwd><kwd>superradical formation</kwd><kwd>Z-saturated formation</kwd><kwd>S -formation</kwd><kwd>multifactorized group</kwd><kwd>F-subnormal subgroup</kwd><kwd>K-F-subnormal subgroup</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при финансовой поддержке Белорусского республиканского фонда фундаментальных исследований (проект № Ф23PHФM-63).</funding-statement><funding-statement xml:lang="en">The work was financially supported by the Belarusian Republican Foundation for Fundamental Research (project no. Ф23PHФM-63).</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Шеметков, Л. А. Формации алгебраических систем / Л. А. Шеметков, А. Н. Скиба. – М.: Наука, 1989. – 256 c.</mixed-citation><mixed-citation xml:lang="en">Shemetkov L. A., Skiba A. N. Formations of Algebraic Systems. Moscow, Nauka Publ., 1989. 256 p. (in Russian).</mixed-citation></citation-alternatives></ref><ref id="cit2"><label>2</label><citation-alternatives><mixed-citation xml:lang="ru">Doerk, K. Finite Soluble Groups / K. Doerk, T. Hawkes. – Berlin; New York: Walter de Gruyter, 1992. – 891 p.</mixed-citation><mixed-citation xml:lang="en">Doerk K., Hawkes T. Finite Soluble Groups. Berlin, New York, Walter de Gruyter, 1992. 891 p.</mixed-citation></citation-alternatives></ref><ref id="cit3"><label>3</label><citation-alternatives><mixed-citation xml:lang="ru">Каморников, С. Ф. Подгрупповые функторы и классы конечных групп / С. Ф. Каморников, М. В. Селькин. – Минск: Бел. наука, 2003. – 254 с.</mixed-citation><mixed-citation xml:lang="en">Kamornikov S. F., Sel’kin V. M. Subgroup Functors and Classes of Finite Groups. Minsk, Belaruskaya navuka Publ., 2003. 254 p. (in Russian).</mixed-citation></citation-alternatives></ref><ref id="cit4"><label>4</label><citation-alternatives><mixed-citation xml:lang="ru">Ballester-Bolinches, A. Classes of Finite Groups / A. Ballester-Bolinches, L. M. Ezquerro. – Dordrecht: Springer, 2006. – 385 p.</mixed-citation><mixed-citation xml:lang="en">Ballester-Bolinches A., Ezquerro L. M. Classes of Finite Groups. Springer, Dordrecht, 2006. 385 p.</mixed-citation></citation-alternatives></ref><ref id="cit5"><label>5</label><citation-alternatives><mixed-citation xml:lang="ru">Шеметков, Л. А. Формации конечных групп / Л. А. Шеметков. – М.: Наука, 1978. – 272 c.</mixed-citation><mixed-citation xml:lang="en">Shemetkov L. A. Formations of Finite Groups. Moscow, Nauka Publ., 1978. 272 p. (in Russian).</mixed-citation></citation-alternatives></ref><ref id="cit6"><label>6</label><citation-alternatives><mixed-citation xml:lang="ru">Murashka, V. I. On Questions Posed by Shemetkov, Ballester-Bolinches, and Perez-Ramos in Finite Group Theory / V. I. Murashka // Mathematical Notes. – 2022. – Vol. 112, № 6. – P. 932–939. https://doi.org/10.1134/s000143462211027x</mixed-citation><mixed-citation xml:lang="en">Murashka V. I. On Questions Posed by Shemetkov, Ballester-Bolinches, and Perez-Ramos in Finite Group Theory. Mathematical Notes, 2022, vol. 112, no. 6, pp. 932–939. https://doi.org/10.1134/s000143462211027x</mixed-citation></citation-alternatives></ref><ref id="cit7"><label>7</label><citation-alternatives><mixed-citation xml:lang="ru">Shemetkov, L. A. Frattini extensions of finite groups and formations / L. A. Shemetkov // Communications in Algebra. – 1997. – Vol. 25, № 3. – P. 955–964. https://doi.org/10.1080/00927879708825900</mixed-citation><mixed-citation xml:lang="en">Shemetkov L. A. Frattini extensions of finite groups and formations. Communications in Algebra, 1997, vol. 25, no. 3, pp. 955–964. https://doi.org/10.1080/00927879708825900</mixed-citation></citation-alternatives></ref><ref id="cit8"><label>8</label><citation-alternatives><mixed-citation xml:lang="ru">Ballester-Bolinches, A. On a question of L. A. Shemetkov / A. Ballester-Bolinches, M. D. Perez-Ramos // Com munications in Algebra. – 1999. – Vol. 27, № 11. – P. 5615–5618. https://doi.org/10.1080/00927879908826777</mixed-citation><mixed-citation xml:lang="en">Ballester-Bolinches A., Perez-Ramos M. D. On a question of L. A. Shemetkov. Communications in Algebra, 1999, vol. 27, no. 11, pp. 5615–5618. https://doi.org/10.1080/00927879908826777</mixed-citation></citation-alternatives></ref><ref id="cit9"><label>9</label><citation-alternatives><mixed-citation xml:lang="ru">Aivazidis, S. Subnormality and residuals for saturated formations: A generalization of Schenkman’s theorem / S. Aivazidis, I. N. Safonova, A. N. Skiba // Journal of Group Theory. – 2021. – Vol. 24, iss. 4. – P. 807–818. https://doi.org/10.1515/jgth-2020-0149</mixed-citation><mixed-citation xml:lang="en">Aivazidis S., Safonova I. N., Skiba A. N. Subnormality and residuals for saturated formations: A generalization of Schenkman’s theorem. Journal of Group Theory, 2021, vol. 24, iss. 4, pp. 807–818. https://doi.org/10.1515/jgth-2020-0149</mixed-citation></citation-alternatives></ref><ref id="cit10"><label>10</label><citation-alternatives><mixed-citation xml:lang="ru">Васильев, А. Ф. О конечных группах с обобщенно субнормальными силовскими подгруппами / А. Ф. Васильев, Т. И. Васильева // Проблемы физики, математики и техники. – 2011. – № 4. – С. 86–91.</mixed-citation><mixed-citation xml:lang="en">Vasil’ev A. F., Vasil’eva T. I. On Finite Groups with Generalized Subnormal Sylow Subgroups. Problemy fiziki, matematiki i tekhniki = Problems of Physics, Mathematics and Technics, 2011, no. 4, pp. 86–91 (in Russian).</mixed-citation></citation-alternatives></ref><ref id="cit11"><label>11</label><citation-alternatives><mixed-citation xml:lang="ru">Murashka, V. I. Classes of finite groups with generalized subnormal cyclic primary subgroups / V. I. Murashka // Siberian Mathematical Journal. – 2014. – Vol. 55. – P. 1105–1115. https://doi.org/10.1134/s0037446614060135</mixed-citation><mixed-citation xml:lang="en">Murashka V. I. Classes of finite groups with generalized subnormal cyclic primary subgroups. Siberian Mathematical Journal, 2014, vol. 55, pp. 1105–1115. https://doi.org/10.1134/s0037446614060135</mixed-citation></citation-alternatives></ref><ref id="cit12"><label>12</label><citation-alternatives><mixed-citation xml:lang="ru">Yi, X. On hereditary superradical formations / X. Yi, S. F. Kamornikov // Siberian Mathematical Journal. – 2016. – Vol. 57. – P. 260–264. https://doi.org/10.1134/s0037446616020087</mixed-citation><mixed-citation xml:lang="en">Yi X., Kamornikov S. F. On hereditary superradical formations. Siberian Mathematical Journal, 2016, vol. 57, pp. 260–264. https://doi.org/10.1134/s0037446616020087</mixed-citation></citation-alternatives></ref><ref id="cit13"><label>13</label><citation-alternatives><mixed-citation xml:lang="ru">Ballester-Bolinches, A. On a problem of L. A. Shemetkov on superradical formations of finite groups / A. BallesterBolinches, S. F. Kamornikov, V. N. Tyutyanov // Journal of Algebra. – 2014. – Vol. 403. – P. 69–76. https://doi.org/10.1016/j.jalgebra.2014.01.004</mixed-citation><mixed-citation xml:lang="en">Ballester-Bolinches A., Kamornikov S. F., Tyutyanov V. N. On a problem of L. A. Shemetkov on superradical formations of finite groups. Journal of Algebra, 2014, vol. 403, pp. 69–76. https://doi.org/10.1016/j.jalgebra.2014.01.004</mixed-citation></citation-alternatives></ref><ref id="cit14"><label>14</label><citation-alternatives><mixed-citation xml:lang="ru">Vasil’ev, A. F. Finite groups with generalized subnormal embedding of Sylow subgroups / A. F. Vasil’ev, T. I. Vasil’eva, A. S. Vegera // Siberian Mathematical Journal. – 2016. – Vol. 57. – P. 200–212. https://doi.org/10.1134/s0037446616020038</mixed-citation><mixed-citation xml:lang="en">Vasil’ev A. F., Vasil’eva T. I., Vegera A. S. Finite groups with generalized subnormal embedding of Sylow subgroups. Siberian Mathematical Journal, 2016, vol. 57, pp. 200–212. https://doi.org/10.1134/s0037446616020038</mixed-citation></citation-alternatives></ref><ref id="cit15"><label>15</label><citation-alternatives><mixed-citation xml:lang="ru">Murashka, V. I. Finite groups with given sets of F-subnormal subgroups / V. I. Murashka // Asian-European Journal of Mathematics. – 2020. – Vol. 13, № 4. – Art. ID 2050073. https://doi.org/10.1142/s1793557120500734</mixed-citation><mixed-citation xml:lang="en">Murashka V. I. Finite groups with given sets of F-subnormal subgroups. Asian-European Journal of Mathematics, 2020, vol. 13, no. 4, art. ID 2050073. https://doi.org/10.1142/s1793557120500734</mixed-citation></citation-alternatives></ref><ref id="cit16"><label>16</label><citation-alternatives><mixed-citation xml:lang="ru">Murashka, V. I. On the σ-nilpotent hypercenter of finite groups / V. I. Murashka, A. F. Vasil’ev // Journal of Group Theory. – 2022. – Vol. 25, № 6. – P. 1083–1098. https://doi.org/10.1515/jgth-2021-0138</mixed-citation><mixed-citation xml:lang="en">Murashka V. I., Vasil’ev A. F. On the σ-nilpotent hypercenter of finite groups. Journal of Group Theory, 2022, vol. 25, no. 6, pp. 1083–1098. https://doi.org/10.1515/jgth-2021-0138</mixed-citation></citation-alternatives></ref><ref id="cit17"><label>17</label><citation-alternatives><mixed-citation xml:lang="ru">Murashka, V. I. Regular saturated formations of finite soluble groups / V. I. Murashka // Journal of Group Theory. – 2025. – Vol. 28, № 6. – P. 1307–1324. https://doi.org/10.1515/jgth-2024-0143</mixed-citation><mixed-citation xml:lang="en">Murashka V. I. Regular saturated formations of finite soluble groups. Journal of Group Theory, 2025, vol. 28, no. 6, pp. 1307–1324. https://doi.org/10.1515/jgth-2024-0143</mixed-citation></citation-alternatives></ref><ref id="cit18"><label>18</label><citation-alternatives><mixed-citation xml:lang="ru">Unsolved Problems in Group Theory. The Kourovka Notebook No. 21 / eds.: V. D. Mazurov, E. I. Khukhro. – Novosibirsk, 2026. – 302 p. – URL: https://arxiv.org/pdf/1401.0300 (accessed at 2 June 2026).</mixed-citation><mixed-citation xml:lang="en">Mazurov V. D., Khukhro E. I. (eds.). Unsolved Problems in Group Theory. The Kourovka Notebook no. 21. Novosibirsk, 2026. Available at: https://arxiv.org/pdf/1401.0300 (accessed at 2 June 2026).</mixed-citation></citation-alternatives></ref><ref id="cit19"><label>19</label><citation-alternatives><mixed-citation xml:lang="ru">Семенчук, В. Н. Характеризация локальных формаций F по заданным свойствам минимальных не F-групп / В. Н. Семенчук, А. Ф. Васильев // Исследование нормального и подгруппового строения конечных групп: труды Гомельского семинара. – Минск, 1984. – С. 175–181.</mixed-citation><mixed-citation xml:lang="en">Semenchuk V. N., Vasil’ev A. F. Characterization of Local Formations F by Given Properties of Minimal Non- Fgroups. Issledovanie normal’nogo i podgruppovogo stroeniya konechnykh grupp: Trudy Gomel’skogo seminara [Investigation of Normal and Subgroup Structure of Finite Groups: Proceedings of the Gomel Seminar]. Minsk, 1984, pp. 175–181 (in Russian).</mixed-citation></citation-alternatives></ref><ref id="cit20"><label>20</label><citation-alternatives><mixed-citation xml:lang="ru">Васильев, А. Ф. Об одном вопросе теории формаций конечных групп / А. Ф. Васильев // Весці Акадэміі навук Беларусі. Серыя физіка-матэматычных навук. – 1994. – № 3. – С. 121–122.</mixed-citation><mixed-citation xml:lang="en">Vasil’ev A. F. On a Question of the Theory of Formations of Finite Groups. Vestsі Akademіі navuk Belarusi. Seryya fіzіka-matematychnykh navuk = Proceedings of the Academy of Sciences of Belarus. Physics and Mathematics series, 1994, no. 3, pp. 121–122 (in Russian).</mixed-citation></citation-alternatives></ref><ref id="cit21"><label>21</label><citation-alternatives><mixed-citation xml:lang="ru">Kamornikov, S. F. On two problems by L. A. Shemetkov / S. F. Kamornikov // Siberian Mathematical Journal. – 1994. – Vol. 35. – P. 713–721. https://doi.org/10.1007/bf02106614</mixed-citation><mixed-citation xml:lang="en">Kamornikov S. F. On two problems by L. A. Shemetkov. Siberian Mathematical Journal, 1994, vol. 35, pp. 713–721. https://doi.org/10.1007/bf02106614</mixed-citation></citation-alternatives></ref><ref id="cit22"><label>22</label><citation-alternatives><mixed-citation xml:lang="ru">Semenchuk, V. N. Solvable F-radical formations / V. N. Semenchuk // Mathematical Notes. – 1996. – Vol. 59, № 2. – P. 185–188. https://doi.org/10.1007/bf02310958</mixed-citation><mixed-citation xml:lang="en">Semenchuk V. N. Solvable F-radical formations. Math Notes, 1996, vol. 59, no. 2, pp. 185–188. https://doi.org/10.1007/bf02310958</mixed-citation></citation-alternatives></ref><ref id="cit23"><label>23</label><citation-alternatives><mixed-citation xml:lang="ru">Мурашко, В. И. Арифметические графы и факторизуемые конечные группы / В. И. Мурашко // Труды Института математики и механики УрО РАН. – 2023. – Т. 29, № 4. – С. 181–192. https://doi.org/10.21538/0134-4889-202329-4-181-192</mixed-citation><mixed-citation xml:lang="en">Murashka V. I. Arithmetic Graphs and Factorizable Finite Groups. Trudy Instituta Matematiki i Mekhaniki UrO RAN [Proceedings of Krasovskii Institute of Mathematics and Mechanics UB RAS], 2023, vol. 29, no. 4, pp. 181–192 (in Russian). https://doi.org/10.21538/0134-4889-2023-29-4-181-192</mixed-citation></citation-alternatives></ref><ref id="cit24"><label>24</label><citation-alternatives><mixed-citation xml:lang="ru">Guo, W. Structure Theory for Canonical Classes of Finite Groups / W. Guo. – Berlin; Heidelberg: Springer-Verlag, 2015. – 258 p. https://doi.org/10.1007/978-3-662-45747-4</mixed-citation><mixed-citation xml:lang="en">Guo W. Structure Theory for Canonical Classes of Finite Groups. Berlin, Heidelberg, Springer-Verlag, 2015. 258 p. https://doi.org/10.1007/978-3-662-45747-4</mixed-citation></citation-alternatives></ref><ref id="cit25"><label>25</label><citation-alternatives><mixed-citation xml:lang="ru">Vasil’ev, A. F. Formations and Products of F(G)-Subnormal Subgroups of Finite Solvable Groups / A. F. Vasil’ev, V. I. Mu rashka // Mathematical Notes. – 2020. – Vol. 107, № 3. – P. 413–424. https://doi.org/10.1134/s0001434620030050</mixed-citation><mixed-citation xml:lang="en">Vasil’ev A. F., Murashka V. I. Formations and Products of F(G)-Subnormal Subgroups of Finite Solvable Groups. Mathematical Notes, 2020, vol. 107, no. 3, pp. 413–424. https://doi.org/10.1134/s0001434620030050</mixed-citation></citation-alternatives></ref><ref id="cit26"><label>26</label><citation-alternatives><mixed-citation xml:lang="ru">Vasil’ev, A. F. Arithmetic graphs and classes of finite groups / A. F. Vasil’ev, V. I. Murashka // Siberian Mathematical Journal. – 2019. – Vol. 60. – P. 41–55. https://doi.org/10.1134/s0037446619010051</mixed-citation><mixed-citation xml:lang="en">Vasil’ev A. F., Murashka V. I. Arithmetic graphs and classes of finite groups. Siberian Mathematical Journal, 2019. vol. 60, pp. 41–55. https://doi.org/10.1134/s0037446619010051</mixed-citation></citation-alternatives></ref><ref id="cit27"><label>27</label><citation-alternatives><mixed-citation xml:lang="ru">Murashka, V. I. On the lattice of hereditary Shemetkov formations of finite groups in a class X / V. I. Murashka // Mathematical Notes. – 2025. – Vol. 118, № 6. – P. 1272–1280. https://doi.org/10.1134/s0001434625605787</mixed-citation><mixed-citation xml:lang="en">Murashka V. I. On the lattice of hereditary Shemetkov formations of finite groups in a class X. Mathematical Notes, 2025, vol. 118, no. 6, pp. 1272–1280. https://doi.org/10.1134/s0001434625605787</mixed-citation></citation-alternatives></ref><ref id="cit28"><label>28</label><citation-alternatives><mixed-citation xml:lang="ru">Skiba, A. N. On σ-subnormal and σ-permutable subgroups of finite groups / A. N. Skiba // Journal of Algebra. – 2015. – Vol. 436. – P. 1–16. https://doi.org/10.1016/j.jalgebra.2015.04.010</mixed-citation><mixed-citation xml:lang="en">Skiba A. N. On σ-subnormal and σ-permutable subgroups of finite groups. Journal of Algebra, 2015, vol. 436, pp. 1–16. https://doi.org/10.1016/j.jalgebra.2015.04.010</mixed-citation></citation-alternatives></ref><ref id="cit29"><label>29</label><citation-alternatives><mixed-citation xml:lang="ru">Skiba, A. N. On some results in the theory of finite partially soluble groups / A. N. Skiba // Communications in Mathematics and Statistics. – 2016. – Vol. 4, № 3. – P. 281–309. https://doi.org/10.1007/s40304-016-0088-z</mixed-citation><mixed-citation xml:lang="en">Skiba A. N. On some results in the theory of finite partially soluble groups. Communications in Mathematics and Statistics, 2016, vol. 4, no. 3, pp. 281–309. https://doi.org/10.1007/s40304-016-0088-z</mixed-citation></citation-alternatives></ref></ref-list><fn-group><fn fn-type="conflict"><p>The authors declare that there are no conflicts of interest present.</p></fn></fn-group></back></article>
