IMANBAEV, N.S.; OSPANOV, M.N. On eigenvalues of third order composite type equations with regular boundary value conditions. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 96, n. 4, p. 44–51, 2019. DOI: 10.31489/2019m4/44-51. Disponível em: https://mts.buketov.edu.kz/mathematics-vestnik/article/view/332. Acesso em: 8 dec. 2025.