The Existence of Solutions for Second-order Differential Equations under Almost Fisher-Type Multivalued F-Contractions in Metric Spaces. European Journal of Pure and Applied Mathematics, Maryland, USA, v. 18, n. 4, p. 6441, 2025. DOI: 10.29020/nybg.ejpam.v18i4.6441. Disponível em: https://www.ejpam.com/index.php/ejpam/article/view/6441. Acesso em: 5 dec. 2025.