@article{1452,
  author = {Mohamed Mahmoud and Xuemin Shen},
  title = {PIS: A practical incentive system for multihop wireless networks},
  year = {2010},
  journal = {IEEE Transactions on Vehicular Technology},
  volume = {59},
  number = {8},
  pages = {4012-4025},
  publisher = {IEEE},
}