Serov, N. I., and R. M. Cherniga. 1997. “Lie Symmetries and Exact Solutions of Nonlinear Equations of Heat Conductivity With Convection Term”. Ukrains’kyi Matematychnyi Zhurnal 49 (9), 1262–1270. https://umj.imath.kiev.ua/index.php/umj/article/view/5125.