@article{
  author = {Azizi, A., Saiedian, J., Babolian, E.},
  title = {Some notes on convergence of homotopy
based methods for functional equations},
  journal = {Theory of Approximation and Applications},
  year = {2014},
  volume = {8},
  number = {2},
  pages = {21-31},
  doi = {}
}