@journal{KUPS-Liang08,
  author = {Qilian Liang and Xiuzhen Cheng},
  title = {KUPS: Knowledge-Based Ubiquitous and Persistent Sensor Networks for Threat Assessment},
  journal = {IEEE Transactions on Aerospace and Electronic Systems},
  pages = {1060-1069},
  volume = {44},
  number = {3},
  month ={July},
  year = {2008},
}