ORUMBAYEVA, N.T.; TOKMAGAMBETOVA, T.D.; NURGALIEVA, Zh.N. On the solvability of a semi-periodic boundary value problem for the nonlinear Goursat equation. Bulletin of the Karaganda University. Mathematics Series, [S. l.], v. 104, n. 4, p. 110–117, 2021. DOI: 10.31489/2021m4/110-117. Disponível em: https://mts.buketov.edu.kz/index.php/mathematics-vestnik/article/view/482. Acesso em: 4 sep. 2025.