Bonafede, S., and I. I. Skrypnik. “On Hölder Continuity of Solutions of Doubly Nonlinear Parabolic Equations With Weight”. Ukrains’kyi Matematychnyi Zhurnal, Vol. 51, no. 7, July 1999, pp. 890–903, https://umj.imath.kiev.ua/index.php/umj/article/view/4678.