Skrypnik, I.I. (2004) “A necessary condition for the regularity of a boundary point for degenerating parabolic equations with measurable coefficients”, Ukrains’kyi Matematychnyi Zhurnal, 56(6), pp. 818–836. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3801 (Accessed: 14 April 2025).