MAZORCHUK, V.; PONOMARENKO, M.; TUROWSKA, L. Some associative algebras related to $U(\mathfrak g)$ and twisted generalized Weyl algebras. Mathematica Scandinavica, Berkeley, CA, United States, v. 92, n. 1, p. 5–30, 2003. DOI: 10.7146/math.scand.a-14392. Disponível em: https://journals.msp.org/mscand/article/view/827. Acesso em: 24 jul. 2026.