TYLYSHCHAK, A. A. On the maximal unipotent subgroups of a special linear group over commutative ring. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 71, n. 8, p. 1150–1156, 2019. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1506. Acesso em: 14 apr. 2025.