BABICH, M. D. On the separation of isolated solutions of nonlinear integral equations. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 48, n. 8, p. 1011–1020, 1996. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5245. Acesso em: 6 dec. 2025.