BlackmoreD., PrykarpatskyA. K., and SamoilenkoA. M. “Hopf Algebras and Integrable Flows Related to the Heisenberg–Weil Coalgebra”. Ukrains’kyi Matematychnyi Zhurnal 56, no. 1 (January 25, 2004): 88-96. Accessed July 27, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3730.