FUSHCHICH, V. I. Symmetry of equations of linear and nonlinear quantum mechanics. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 49, n. 1, p. 164–176, 1997. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4994. Acesso em: 14 apr. 2025.