@article{
  author = {Kamarian, S, Yas, M.H, Pourasghar, A},
  title = {Free Vibrations of Continuous Grading Fiber Orientation Beams on Variable Elastic Foundations},
  journal = {Journal of Solid Mechanics},
  year = {2012},
  volume = {4},
  number = {1},
  pages = {75-83},
  doi = {}
}