LAGNO, V. I.; FUSHCHICH, V. I. Linear and nonlinear representations of Galilei groups in two-dimensional space-time. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 50, n. 3, p. 414–423, 1998. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4941. Acesso em: 5 dec. 2025.