Chandana Gamage, Jussipekka Leiwo, Yuliang Zheng. Why Hierarchical Key Distribution Is Appropriate for Multicast Networks. In JooSeok Song, editor, Information Security and Cryptology - ICISC 99, Second International Conference, Seoul, Korea, December 9-10, 1999, Proceedings. Volume 1787 of Lecture Notes in Computer Science, pages 120-131, Springer, 1999.