MEL'NIK, V. S. Multivariational Inequalities and Operator Inclusions in Banach Spaces with Mappings of the Class $(S)_{+}$. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 52, n. 11, p. 1513–1523, 2000. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4557. Acesso em: 5 dec. 2025.