TYMKIV, I.R. Multipoint problem with for factorized parabolic operator with variable coefficients. Carpathian Mathematical Publications, [S. l.], v. 3, n. 2, p. 120–130, 2011. Disponível em: https://journals.pnu.edu.ua/index.php/cmp/article/view/3074. Acesso em: 3 jul. 2024.