@article{
  author = {Yas, M.H, Kamarian, S, Jam, J.E, Pourasghar, A},
  title = {Optimization of Functionally Graded Beams Resting on Elastic Foundations},
  journal = {Journal of Solid Mechanics},
  year = {2011},
  volume = {3},
  number = {4},
  pages = {365-378},
  doi = {}
}