Size-dependent nonlinear free vibration of multilayer functionally graded graphene nanocomposite Timoshenko microbeam under different boundary conditionsFarshid Allahkarami and Hasan TohidiEur. Phys. J. Plus, 137 1 (2022) 5DOI: https://doi.org/10.1140/epjp/s13360-021-02193-2