ROMANENKO, I. B.; SKRYPNIK, I. V. A priori estimates of solutions of linear parabolic problems with coefficients from Sobolev spaces. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 51, n. 11, p. 1534–1548, 1999. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4755. Acesso em: 5 dec. 2025.