BLAZHKO, L. M.; ZHADAN, T. O.; SEROV, N. I. Classification of linear representations of the Galilei, Poincaré, and conformal algebras in the case of a two-dimensional vector field and their applications. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 58, n. 8, p. 1128–1145, 2006. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3518. Acesso em: 5 dec. 2025.