Galerkin-Vlasov approach for bending analysis of flexoelectric doubly-curved sandwich nanoshells with piezoelectric/FGP/piezoelectric layers using the nonlocal strain theory. - Ke, Tran Van; Thom, Do Van; Dung, Nguyen Thai; Chinh, Nguyen Van; Minh, Phung Van (Acta Mechanica Sinica, 2025)