SUKRETNIY, K.; JUSHENKO, E. On $*$-wildness of a free product of finite-dimensional $C^*$-algebras. Methods of Functional Analysis and Topology, [S. l.], v. 12, n. 2, p. 151–156, 2006. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/309. Acesso em: 16 dec. 2025.