Closed-form expression for geometrically nonlinear large deformation of nano-beams subjected to end forceMohammad A. Maneshi, Esmaeal Ghavanloo and S. Ahmad FazelzadehEur. Phys. J. Plus, 133 7 (2018) 256DOI: https://doi.org/10.1140/epjp/i2018-12084-0