Jushenko, E., Albeverio, S., Proskurin, D. P., & Samoilenko, Y. S. (2006). $*$-wildness of some classes of $C^*$-algebras. Methods of Functional Analysis and Topology, 12(4), 315-325. https://zen.imath.kiev.ua/index.php/mfat/article/view/325