Heeyoul Kim Younho Lee Yongsu Park Hyunsoo Yoon Reactive Key Management Scheme for Access Control in Group Communications. 982-986 2007 90-B IEICE Transactions 4 http://dx.doi.org/10.1093/ietcom/e90-b.4.982 db/journals/ieicet/ieicet90b.html#KimLPY07