@article{
  author = {Ayagh, Zahra, Farkhondeh, Mahsa, Malek Akhlagh, Esmaeil},
  title = {The Role and Status of Upgrading Techniques in Global Value Chains},
  journal = { Roshd -e- Fanavari},
  year = {2013},
  volume = {9},
  number = {34},
  pages = {1-10},
  doi = {}
}