@article{1021,
  author = {Ning Zhang and Haibo Zhou and Kan Zheng and Nan Cheng and Jon Mark and Xuemin Shen},
  title = {Cooperative heterogeneous framework for spectrum harvesting in cognitive cellular network},
  year = {2015},
  journal = {IEEE Communications Magazine},
  volume = {53},
  number = {5},
  pages = {60-67},
  publisher = {IEEE},
}