Inequalities and Separation for a Biharmonic Laplace-Beltrami Differential Operator in a Hilbert Space Associated with the Existence and Uniqueness Theorem. Journal of Partial Differential Equations, [S. l.], v. 29, n. 1, p. 59–70, 2016. DOI: 10.4208/jpde.v29.n1.6. Disponível em: https://www.global-sci.com/index.php/jpde/article/view/14966. Acesso em: 6 dec. 2025.