@article{
  author = {Mokhtari, F, Tadi Beni, Y},
  title = {Free Vibration Analysis of Microtubules as Orthotropic Elastic Shells Using Stress and Strain Gradient Elasticity Theory},
  journal = {Journal of Solid Mechanics},
  year = {2016},
  volume = {8},
  number = {3},
  pages = {511-529},
  doi = {}
}