@article {vlbdjMatlas, title = {Unveiling the complexity of human mobility by querying and mining massive trajectory data}, journal = {VLDB J.}, volume = {20}, number = {5}, year = {2011}, pages = {695-719}, author = {Fosca Giannotti and Mirco Nanni and Dino Pedreschi and Fabio Pinelli and Chiara Renso and S Rinzivillo and Roberto Trasarti} }