@article {springerlink:10.1007/s13218-012-0181-8,
   author = {Rinzivillo, Salvatore and Mainardi, Simone and Pezzoni, Fabio and Coscia, Michele and Pedreschi, Dino and Giannotti, Fosca},
   affiliation = {ISTI-CNR, Pisa, Italy},
   title = {Discovering the Geographical Borders of Human Mobility},
   journal = {KI - Künstliche Intelligenz},
   publisher = {Springer Berlin / Heidelberg},
   issn = {0933-1875},
   keyword = {Computer Science},
   pages = {253-260},
   volume = {26},
   issue = {3},
   url = {http://dx.doi.org/10.1007/s13218-012-0181-8},
   note = {10.1007/s13218-012-0181-8},
   year = {2012}
}