Xiaojian Li Xinping Zhao A Protocol of Bidirectional Authentication and Authorization for IP Multicast. 1904-1913 2006 43 J. Comput. Res. Dev. 11 http://WWW.CQVIP.COM/QK/94913X/200611/23242934.html db/journals/jcrd/jcrd43.html#LiZ06