Yuri Demchenko Cees de Laat Oscar Koeroo David L. Groep Re-thinking Grid Security Architecture. 79-86 2008 eScience http://doi.ieeecomputersociety.org/10.1109/eScience.2008.53 conf/eScience/2008 db/conf/eScience/eScience2008.html#DemchenkoLKG08