SOBKOVICH, R.I.; KAZMERCHUK, A.I. Construction on the Green function for Vallee-Poussin problem for nonlinear system of differential equations. Carpathian Mathematical Publications, [S. l.], v. 5, n. 1, p. 121–128, 2013. DOI: 10.15330/cmp.5.1.121-128. Disponível em: https://journals.pnu.edu.ua/index.php/cmp/article/view/3660. Acesso em: 3 may. 2024.