@article{
  author = {Vahidi, A. R., Azimzadeh, Z., Shahrestani‎, M.},
  title = {Modified homotopy perturbation method for solving non-linear oscillator's ‎equations},
  journal = {International Journal of Industrial Mathematics},
  year = {2016},
  volume = {8},
  number = {4},
  pages = {415-421},
  doi = {}
}