SOBKOVICH, R.I.; KAZMERCHUK, A.I. Solvability of $n$-point problems with parameter for system of differential equation. Carpathian Mathematical Publications, [S. l.], v. 2, n. 2, p. 116–122, 2010. Disponível em: https://journals.pnu.edu.ua/index.php/cmp/article/view/3973. Acesso em: 6 may. 2024.