@article{zhang02__virtual_operat_aaa_wirel_lan,
  author = {Zhang, Junbiao and Li, Jun and Weinstein, Stephen and Tu, Nan},
  title = {Virtual Operator based AAA in Wireless LAN Hot Spots with Ad-hoc Networking Support},
  journal = {Mobile Computing and Communications Review},
  year = {2002},
  volume = {6},
  number = {3},
  pages = {10--21},
  month = {July}
}