Antoniouk, A. Val., and A. Vict. Antoniouk. 2008. “Continuity With Respect to Initial Data and Absolute-Continuity Approach to the First-Order Regularity of Nonlinear Diffusions on Noncompact Manifolds”. Ukrains’kyi Matematychnyi Zhurnal 60 (10), 1299–1316. https://umj.imath.kiev.ua/index.php/umj/article/view/3245.