@article{
  author = {Hashemi, Shima sadat},
  title = { A Study about Registration Level of Patent Offices in European Union, U.S.A and Iran },
  journal = { Roshd -e- Fanavari},
  year = {2007},
  volume = {3},
  number = {12},
  pages = {1-10},
  doi = {}
}