Piryatinskaya, A. Yu., and Yu. S. Samoilenko. “Wild Problems in the Theory of Representations of *-Algebras Generated by Generatrices and Relations”. Ukrains’kyi Matematychnyi Zhurnal 47, no. 1 (January 25, 1995): 70–78. Accessed April 11, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/5384.