LOPATIN, A. K. Normalization and averaging on compact lie groups in nonlinear mechanics. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 49, n. 1, p. 47–67, 1997. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4986. Acesso em: 6 dec. 2025.