@article{b-mmwnc-01,
  author = {Christian Bettstetter},
  title = {Mobility {M}odeling in {W}ireless {N}etworks: {C}ategorization,
 {S}mooth {M}ovement, and {B}order {E}ffects},
  journal = {ACM Mobile Computing and Communications Review},
  volume = {5},
  number = {3},
  pages = {55-67},
  month = {July},
  year = {2001}
}