@article{CDWX:WINET:2008,
  author    = {Xiuzhen Cheng and Ding-Zhu Du and Lusheng Wang and Baogang Xu}, 
  title     = {Relay Sensor Placement in Wireless Sensor Networks}, 
  journal   = {Wireless Networks},
  volume    = {14},
  number    = {3},
  month     = {June},
  year      = {2008},
  pages     = {347--355}
}