Zhdanov, R. Z., and V. I. Lagno. “On New Realizations of the Poincare Groups P (1,2) and P(2, 2)”. Ukrains’kyi Matematychnyi Zhurnal 52, no. 4 (April 25, 2000): 447–462. Accessed April 16, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/4436.