@article{
  author = {Darzi, R., Agheli, B.},
  title = {An optimal analytical method for nonlinear boundary value problems based on method of variation of parameter},
  journal = {Journal of New Researches in Mathematics},
  year = {2018},
  volume = {3},
  issue = {4},
  pages = {55-70},
  doi = {},
  url = {https://sanad.iau.ir/fa/Article/798779}
}