КЛЮС, І. Multipoint problem for intehrodyferentsialnyh partial differential equations, not solvable on higher derivatives. Proceedings of National Aviation University, [S. l.], v. 31, n. 1, p. 189–191, 2007. DOI: 10.18372/2306-1472.31.1459. Disponível em: https://jrnl.nau.edu.ua/index.php/visnik/article/view/1459. Acesso em: 19 jan. 2025.