SKRYPNIK, I. I. Regularity of a boundary point for singular parabolic equations with measurable coefficients. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 56, n. 4, p. 506–516, 2004. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3772. Acesso em: 6 dec. 2025.