Pukalskyi, I. D. “Boundary-Value Problem for Linear Parabolic Equations With Degeneracies”.
Ukrains’kyi Matematychnyi Zhurnal
57, no. 3 (March 25, 2005): 377–387. Accessed April 11, 2025.
https://umj.imath.kiev.ua/index.php/umj/article/view/3605
.