GHAZARYAN, Hayk; MARGARYAN, Vachagan. On interior regularity of solutions of a class of almost-hypoelliptic equations. Armenian Journal of Mathematics. Armenian Journal of Mathematics, Yerevan, Armenia, v. 3, n. 2, p. 32–60, 2010. Disponível em: https://armjmath.sci.am/index.php/ajm/article/view/71. Acesso em: 4 apr. 2025.