Richard O. Sinnott David W. Chadwick Thomas Doherty David Martin Anthony Stell Gordon Stewart Linying Su J. P. Watt Advanced Security for Virtual Organizations: The Pros and Cons of Centralized vs Decentralized Security Models. 106-113 2008 CCGRID http://doi.ieeecomputersociety.org/10.1109/CCGRID.2008.67 conf/ccgrid/2008 db/conf/ccgrid/ccgrid2008.html#SinnottCDMSSSW08