SergienkoU. O. 2002. “On Representations of C*-Algebras O<em class="a-Plus-plus">n</Em&gt;, α of the Cuntz Type”. Ukrains’kyi Matematychnyi Zhurnal 54 (1), 142-45. https://umj.imath.kiev.ua/index.php/umj/article/view/4049.