Boichuk О. A.; ZHURAVLEV, V. F.; SAMOILENKO, A. M. Weakly nonlinear boundary-value problems for operator equations with pulse influence. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 49, n. 2, p. 272–288, 1997. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5004. Acesso em: 14 apr. 2025.