Afanaseva, N. V., and A. F. Tedeev. 2005. “Theorems on the Existence and Nonexistence of Solutions of the Cauchy Problem for Degenerate Parabolic Equations With Nonlocal Source”. Ukrains’kyi Matematychnyi Zhurnal 57 (11): 1443–1464. https://umj.imath.kiev.ua/index.php/umj/article/view/3700.