Malytska, H.P., and I.V. Burtnyak. “Construction of the Fundamental Solution of a Class of Degenerate Parabolic Equations of High Order”. Carpathian Mathematical Publications 12, no. 1 (June 12, 2020): 79–87. Accessed November 24, 2024. https://vps.pnu.edu.ua/index.php/cmp/article/view/3871.