SHERIYAZDAN, T. T. Marginal problem with departure from characteristics for multivariate equation of Gellerstedt. Journal of Mathematics, Mechanics and Computer Science, [S. l.], v. 64, n. 1, p. 88–92, 2019. Disponível em: https://bm.kaznu.kz/index.php/kaznu/article/view/603. Acesso em: 22 dec. 2024.