The Existence of Solutions for Second-order Differential Equations under Almost Fisher-Type Multivalued F-Contractions in Metric Spaces. Eur. J. Pure Appl. Math. [Internet]. 2025 Nov. 5 [cited 2026 Jan. 20];18(4):6441. Available from: https://www.ejpam.com/index.php/ejpam/article/view/6441