KASYANOV, P. O.; MEL'NIK, V. S. On properties of subdifferential mappings in Fréchet spaces. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 57, n. 10, p. 1385–1394, 2005. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3692. Acesso em: 6 dec. 2025.