Solution of the nonlinear Klein-Gordon equation for two new terms via the Adomian decomposition methodH. Ghasemi, M. Ghovatmand, S. Zarrinkamar and H. HassanabadiEur. Phys. J. Plus, 129 2 (2014) 32DOI: https://doi.org/10.1140/epjp/i2014-14032-4