@article{1554,
  author = {Haojin Zhu and Xiaodong Lin and Rongxing Lu and Yanfei Fan and Xuemin Shen},
  title = {Smart: A secure multilayer credit-based incentive scheme for delay-tolerant networks},
  year = {2009},
  journal = {IEEE Transactions on Vehicular Technology},
  volume = {58},
  number = {8},
  pages = {4628-4639},
  publisher = {IEEE},
}