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Size-Dependent Geometrically Nonlinear Free Vibration of First-Order Shear Deformable Piezoelectric-Piezomagnetic Nanobeams Using the Nonlocal Theory. Adv. Appl. Math. Mech. 2018, 10 (1), 184-208. https://doi.org/10.4208/aamm.2015.m1298.