SergienkoU. O. “On Representations of C*-Algebras O<em class="a-Plus-plus">n</Em&gt;, α of the Cuntz Type”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 54, no. 1, Jan. 2002, pp. 142-5, https://umj.imath.kiev.ua/index.php/umj/article/view/4049.