SamoilenkoV. G., and SidorenkoYu. M. 1998. “Hierarchy of the Matrix Burgers Equations and Integrable Reductions in the Davey-Stewartson System”. Ukrains’kyi Matematychnyi Zhurnal 50 (2), 252–263. https://umj.imath.kiev.ua/index.php/umj/article/view/4959.