Livins’kyiI. V.; RadchenkoD. V. 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**, v. 64, n. 12, p. 1654-1675, 25 Dec. 2012.