@article{1114,
  author = {Zhongming Zheng and Xiaoxia Zhang and Lin Cai and Ran Zhang and Xuemin Shen},
  title = {Sustainable communication and networking in two-tier green cellular networks},
  year = {2014},
  journal = {IEEE Wireless Communications},
  volume = {21},
  number = {4},
  pages = {47-53},
  publisher = {IEEE},
}