ASROROV, F. A.; PERESTYUK, N. A. Green-Samoilenko function and existence of integral sets of linear extensions of nonautonomous equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 8, p. 1067–1071, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5659. Acesso em: 5 dec. 2025.