Livins’kyi, I. V., and D. V. Radchenko. “Representations of Algebras Defined by a Multiplicative Relation and Corresponding to the Extended Dynkin Graphs $\tilde{D}_4, \tilde{E}_6, \tilde{E}_7, \tilde{E}_8$”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 64, no. 12, Dec. 2012, pp. 1654-75, https://umj.imath.kiev.ua/index.php/umj/article/view/2689.