@article{DSA-WC-12,
  author = {Min Song and Chunsheng Xin and Yanxiao Zhao and Xiuzhen Cheng},
  title = {Dynamic Spectrum Access: From Cognitive Radio to Network Radio},
  journal = {IEEE Wireless Communications},
  volume = {19},
  number = {1},
  pages = {23-29},
  month = {February},
  year = {2012},
}