TUSHEV, A. V. On ideals of the group algebra of a free group of degree of freedom two over the field of complex numbers. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 47, n. 4, p. 571–572, 1995. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5460. Acesso em: 5 dec. 2025.