Khomenko О.M. (2000) “α-Primitive Elements in the Generalized Verma Modules”, Ukrains’kyi Matematychnyi Zhurnal, 52(8), pp. 1135–1140. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4518 (Accessed: 10 April 2025).