Bonafede, S., and I. I. Skrypnik. 1999. “On Hölder Continuity of Solutions of Doubly Nonlinear Parabolic Equations With Weight”.
Ukrains’kyi Matematychnyi Zhurnal
51 (7): 890–903.
https://umj.imath.kiev.ua/index.php/umj/article/view/4678
.