Ramu Panayappan Jayini Mukul Trivedi Ahren Studer Adrian Perrig VANET-based approach for parking space availability. 75-76 2007 conf/mobicom/2007vanet Vehicular Ad Hoc Networks http://doi.acm.org/10.1145/1287748.1287763 db/conf/mobicom/vanet2007.html#PanayappanTSP07