MARGARYAN, V.; GHAZARYAN, H. On fundamental solutions of a class of weak hyperbolic operators. Eurasian Mathematical Journal, [S. l.], v. 9, n. 2, p. 54–67, 2018. DOI: 10.32523/2077-9879-2018-9-2-54-67. Disponível em: https://emj.enu.kz/index.php/main/article/view/116. Acesso em: 30 sep. 2026.