Blackmore, D., Prykarpatsky, A. K., & Samoilenko, A. M. (2004). Hopf Algebras and Integrable Flows Related to the Heisenberg–Weil Coalgebra. Ukrains’kyi Matematychnyi Zhurnal, 56(1), 88-96. https://umj.imath.kiev.ua/index.php/umj/article/view/3730