Nonlinear forced vibrations of sandwich smart nanobeams with two-phase piezo-magnetic face sheetsSeyed Sajad Mirjavadi, Masoud Forsat, Mohammad Nikookar, Mohammad Reza Barati and AMS HamoudaEur. Phys. J. Plus, 134 10 (2019) 508DOI: https://doi.org/10.1140/epjp/i2019-12806-8