@conference {684, title = {A Gravity Model for Speed Estimation over Road Network}, booktitle = {2013 {IEEE} 14th International Conference on Mobile Data Management, Milan, Italy, June 3-6, 2013 - Volume 2}, year = {2013}, doi = {10.1109/MDM.2013.83}, url = {http://dx.doi.org/10.1109/MDM.2013.83}, author = {Paolo Cintia and Roberto Trasarti and Jos{\'e} Ant{\^o}nio Fernandes de Mac{\^e}do and Livia Almada and Camila Fereira} }