Blazhko, L. M., Zhadan, T. O., & Serov, N. I. (2006). 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(8), 1128–1145.
https://umj.imath.kiev.ua/index.php/umj/article/view/3518