@article{khouaja02__hierar_mobil_contr_networ,
  author = {Khouaja, Y. and Guilloard, K. and Bonnin, J. M.},
  title = {Hierarchical Mobility Controlled by the Network},
  journal = {Multiaccess, Mobility and Teletraffic for Wireless Communications},
  year = {2002},
  volume = {6},
  month = {June}
}