@incollection{Timpf2019,
  author    = {Sabine Timpf},
  title     = {Geographic activity models},
  booktitle = {Foundations of geographic information science},
  editor    = {Matt Duckham and Michael F. Goodchild and Michael F. Worboys},
  isbn      = {0415307260},
  doi       = {10.1201/9780203009543-19},
  year      = {2019},
}