MEDVID’, I. M. Higher-order parabolic variational inequality in unbounded domains. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 60, n. 7, p. 949–968, 2008. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3211. Acesso em: 14 apr. 2025.