Effective nonlocal finite element formulation for free vibration analysis of S-FGM doubly curved nanoshells based on linear strain-displacement relations using TSDT. - Weeraphan Jiammeepreecha; Komkorn Chaidachatorn; Boonchai Phungpaingam; Karun Klaycham; Somchai Chucheepsakul (Comput. Math. Appl., 2025)