Bazalii, B. V., and M. V. Krasnoshchok. “Classical Solvability of the First Initial Boundary-Value Problem for a Nonlinear Strongly Degenerate Parabolic Equation”. Ukrains’kyi Matematychnyi Zhurnal 56, no. 10 (October 25, 2004): 1299-1320. Accessed April 28, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3844.