Barannik , L. F. “Subalgebras of Generalized Extended Galileo Algebra”. Ukrains’kyi Matematychnyi Zhurnal 40, no. 6 (November 1, 1988): 705–709. Accessed February 17, 2026. https://umj.imath.kiev.ua/index.php/umj/article/view/9278.