Dynamic analysis of multi-layered composite beams reinforced with graphene platelets resting on two-parameter viscoelastic foundationSaeedeh Qaderi, Farzad Ebrahimi and Mahesh VinyasEur. Phys. J. Plus, 134 7 (2019) 339DOI: https://doi.org/10.1140/epjp/i2019-12739-2