Kabluchko, Z. A., D. P. Proskurin, and Yu. S. Samoilenko. 2004. “On C*-Algebras Generated by Deformations of CCR”. Ukrains’kyi Matematychnyi Zhurnal 56 (11): 1527-38. https://umj.imath.kiev.ua/index.php/umj/article/view/3863.