@article{
  author = {Jahanbeigi, A., Kalantari, M. E.},
  title = {NGN Management Model and Utility Networks’ Estimated Capital Investment in Operation  Support Systems for the Next Years},
  journal = {Nashriyyah -i Muhandisi -i Barq va Muhandisi -i Kampyutar -i Iran},
  year = {2009},
  volume = {7},
  number = {2},
  pages = {114-124},
  doi = {}
}