@article{TimpfKuhn2003,
  author    = {Sabine Timpf and Werner Kuhn},
  title     = {Granularity transformations in wayfinding},
  journal   = {Lecture Notes in Computer Science},
  volume    = {2685},
  pages     = {77 -- 88},
  doi       = {10.1007/3-540-45004-1_5},
  year      = {2003},
}