@article{
  author = {Rashidinia, J., Kalvand, D., Tepoyan, L.},
  title = {Approximate solution of fourth order differential equation in Neumann problem},
  journal = {Journal of Linear and Topological Algebra},
  year = {2013},
  volume = {2},
  number = {4},
  pages = {243-254},
  doi = {}
}