Mitsuhiro Mabuchi Yasushi Shinjo Akira Sato Kazuhiko Kato An Access Control Model for Web-Services That Supports Delegation and Creation of Authority. 213-222 2008 ICN http://doi.ieeecomputersociety.org/10.1109/ICN.2008.72 conf/icn/2008 db/conf/icn/icn2008.html#MabuchiSSK08