ORLOV, I. V. Compact–analytical properties of variational functional in Sobolev spaces \(W^{1,p}\). Eurasian Mathematical Journal, [S. l.], v. 3, n. 2, p. 94–119, 2012. Disponível em: https://emj.enu.kz/index.php/main/article/view/794. Acesso em: 1 nov. 2025.