BlazhkoL. M., ZhadanT. O., and SerovN. 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 58, no. 8 (August 25, 2006): 1128–1145. Accessed November 22, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3518.