Shishkov, A. “Instantaneous Shrinking Phenomenon for Solutions of Higher-Dimensional Nonlinear Diffusion-Convection Equations”. Methods of Functional Analysis and Topology 5, no. 3 (September 25, 1999): 54–76. Accessed February 4, 2026. https://zen.imath.kiev.ua/index.php/mfat/article/view/99.