JaeCheol Ha Hwankoo Kim JeaHoon Park Sang-Jae Moon Juan Manuel González Nieto Colin Boyd HGLAP - Hierarchical Group-Index Based Lightweight Authentication Protocol for Distributed RFID System. 557-567 2007 conf/euc/2007w EUC Workshops http://dx.doi.org/10.1007/978-3-540-77090-9_52 db/conf/euc/eucw2007.html#HaKPMNB07