VASILYEV, V.B. On some approximate calculations for certain pseudo-differential equations. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 91, n. 3, p. 9–16, 2018. DOI: 10.31489/2018m3/9-16. Disponível em: https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/181. Acesso em: 9 jul. 2025.