@article{Johari2012IJCNS,
  title={Weighted Sum Rate Maximization in OFDM Based Cooperative Cognitive Radios: A Joint Optimization Approach},
  author={Johari, Pedram and Vakili, Vahid Tabataba},
  volume = "5",
  number = "5",
  month = "May",
  year={2012},
  pages = "263-271"
}