Jiageng Li. Integrated Authorization for Grid System Environments. In Soraya Kouadri Mostéfaoui, Zakaria Maamar, editors, Ubiquitous Computing, Proceedings of the 2nd International Workshop on Ubiquitous Computing, IWUC 2005, In conjunction with ICEIS 2005, Miami, USA, May 2005. pages 94-100, INSTICC Press, 2005.