Gabi Dreo Rodosek Matthias Gohner Mario Golling Michael Kretzschmar Towards an Accounting System for Multi-Provider Grid Environments. 60-69 2007 conf/im/2007 Integrated Network Management http://dx.doi.org/10.1109/INM.2007.374770 db/conf/im/im2007.html#RodosekGGK07