Smirnov, Yuri F., and Alexander Turbiner. “gln+1 ALGEBRA OF MATRIX DIFFERENTIAL OPERATORS AND MATRIX QUASI-EXACTLY-SOLVABLE PROBLEMS”. Acta Polytechnica 53, no. 5 (October 29, 2013): 462–469. Accessed May 12, 2025. https://ojst.is.cvut.cz/ojs/index.php/ap/article/view/1872.