@article{1247,
  author = {Lei Lei and Zhangdui Zhong and Chuang Lin and Xuemin Shen},
  title = {Operator controlled device-to-device communications in LTE-advanced networks},
  year = {2012},
  journal = {IEEE Wireless Communications},
  volume = {19},
  number = {3},
  publisher = {IEEE},
}