Kovalenko, S. S. “Symmetry Analysis and Exact Solutions of One Class of (1 + 3)-Dimensional Boundary-Value Problems of the Stefan Type”. Ukrains’kyi Matematychnyi Zhurnal 63, no. 10 (October 25, 2011): 1352-1359. Accessed April 20, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2811.