Mazorchuk, V., M. Ponomarenko, and L. Turowska. “Some Associative Algebras Related to $U(\mathfrak g)$ and Twisted Generalized Weyl Algebras”. MATHEMATICA SCANDINAVICA 92, no. 1 (March 1, 2003): 5–30. Accessed August 14, 2026. https://tidsskrift.dk/math/article/view/14392.