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Michael Aschbacher. Finite Group Theory, volume 10. Cambridge University Press, 2000.Search in Google Scholar
Grzegorz Bancerek, Czesław Byliński, Adam Grabowski, Artur Korniłowicz, Roman Matuszewski, Adam Naumowicz, Karol Pąk, and Josef Urban. Mizar: State-of-the-art and beyond. In Manfred Kerber, Jacques Carette, Cezary Kaliszyk, Florian Rabe, and Volker Sorge, editors, Intelligent Computer Mathematics, volume 9150 of Lecture Notes in Computer Science, pages 261–279. Springer International Publishing, 2015. ISBN 978-3-319-20614-1. doi:10.1007/978-3-319-20615-8 17.Search in Google Scholar
David S. Dummit and Richard M. Foote. Abstract Algebra. Wiley and Sons, Third edition, 2004.Search in Google Scholar
Adam Grabowski, Artur Korniłowicz, and Christoph Schwarzweller. On algebraic hierarchies in mathematical repository of Mizar. In M. Ganzha, L. Maciaszek, and M. Paprzycki, editors, Proceedings of the 2016 Federated Conference on Computer Science and Information Systems (FedCSIS), volume 8 of Annals of Computer Science and Information Systems, pages 363–371, 2016. doi:10.15439/2016F520.Search in Google Scholar
Thomas W. Hungerford. Algebra, volume 73 of Graduate Texts in Mathematics. Springer-Verlag New York Inc., Seattle, Washington USA, Department of Mathematics University of Washington edition, 1974.Search in Google Scholar
I. Martin Isaacs. Finite Group Theory, volume 92 of Graduate Studies in Mathematics. American Mathematical Society, 2008.Search in Google Scholar
Aleksandr Gennadievich Kurosh. The Theory of Groups, volume 1. Chelsea Publishing Company, 1955.Search in Google Scholar
Kazuhisa Nakasho, Hiroyuki Okazaki, Hiroshi Yamazaki, and Yasunari Shidama. Equivalent expressions of direct sum decomposition of groups. Formalized Mathematics, 23(1): 67–73, 2015. doi:10.2478/forma-2015-0006.Search in Google Scholar
Kazuhisa Nakasho, Hiroshi Yamazaki, Hiroyuki Okazaki, and Yasunari Shidama. Definition and properties of direct sum decomposition of groups. Formalized Mathematics, 23 (1):15–27, 2015. doi:10.2478/forma-2015-0002.Search in Google Scholar
Alexander M. Nelson. Characteristic subgroups. Formalized Mathematics, 30(2):79–91, 2022. doi:10.2478/forma-2022-0007.Search in Google Scholar
Derek Robinson. A Course in the Theory of Groups. Springer New York, 2012.Search in Google Scholar