@article{HirtleTimpfTenbrink2011,
  author    = {Stephen C. Hirtle and Sabine Timpf and Thora Tenbrink},
  title     = {The effect of activity on relevance and granularity for navigation},
  journal   = {Lecture Notes in Computer Science},
  volume    = {6899},
  pages     = {73 -- 89},
  doi       = {10.1007/978-3-642-23196-4_5},
  year      = {2011},
}