GRUNAU, H.-C.; OKABE, S. Willmore Obstacle Problems under Dirichlet Boundary Conditions. ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE, [S. l.], v. 24, n. 3, p. 1415-1462, 2023. DOI: 10.2422/2036-2145.202105_064. Disponível em: https://journals.sns.it/index.php/annaliscienze/article/view/5777. Acesso em: 20 feb. 2026.