BURTNYAK, I.V.; MALYTSKA, H.P. Fundamental matrix of solutions for one class of parabolic degenerate systems: Array. Carpathian Mathematical Publications, [S. l.], v. 4, n. 1, p. 12–22, 2012. Disponível em: https://journals.pnu.edu.ua/index.php/cmp/article/view/2396. Acesso em: 28 mar. 2024.