SerovN. I., & ChernigaR. M. (2003). Lie Symmetries, <em class="a-plus-plus">Q</em&gt;-Conditional Symmetries, and Exact Solutions of Nonlinear Systems of Diffusion-Convection Equations. Ukrains’kyi Matematychnyi Zhurnal, 55(10), 1340-1355. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/4006