Kovtun, I. I., and M. N. Feller. “Boundary Problems and Initial-Boundary Value Problems for One Class of Nonlinear Parabolic Equations With Lévy Laplacian”. Methods of Functional Analysis and Topology 17, no. 2 (June 25, 2011): 118–125. Accessed February 4, 2026. https://zen.imath.kiev.ua/index.php/mfat/article/view/476.