OSPANOV, K.N.; YESKABYLOVA, Zh.B. Conditions of coercive solvability of third-order differential equation with unbounded intermediate coefficients. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 94, n. 2, p. 56–69, 2019. DOI: 10.31489/2019m2/56-69. Disponível em: http://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/290. Acesso em: 18 aug. 2025.