AntonioukA. Val., and AntonioukA. Vict. 2006. “Nonlinear-Estimate Approach to the Regularity of Infinite-Dimensional Parabolic Problems”. Ukrains’kyi Matematychnyi Zhurnal 58 (5), 579–596. https://umj.imath.kiev.ua/index.php/umj/article/view/3477.