@article{10994,
  author = {D. He and C. Chen and S. Chan and J. Bu and Yan Zhang},
  title = {Security and Efficiency in Roaming Services for Wireless Networks: Challenges, Approaches and Prospects},
  year = {2013},
  journal = {IEEE Communications Magazine},
  volume = {51},
  number = {2},
  pages = {142-150},
}