MAZORCHUK, V. S. On unitarizable modules over generalized Virasoro algebras. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 50, n. 9, p. 1278–1280, 1998. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4845. Acesso em: 6 dec. 2025.