LOPATIN , A. K. Certain aspects of theoretical-group approach in problems of nonlinear mechanics. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 44, n. 1, p. 22–33, 1992. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2317. Acesso em: 6 dec. 2025.