KLIMYK, A. U. Representations of the $q$-deformed algebra $U’_q(so_{2,2})$. Methods of Functional Analysis and Topology, [S. l.], v. 3, n. 3, p. 13–27, 1997. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/41. Acesso em: 19 dec. 2025.