Catalin Dumitrescu Ioan Raicu Ian T. Foster The Design, Usage, and Performance of GRUBER: A <i>G</i>rid <i>U</i>sage Service Level Agreement based <i>B</i>rok<i>ER</i>ing Infrastructure. 99-126 2007 5 J. Grid Comput. 1 http://dx.doi.org/10.1007/s10723-006-9060-6 db/journals/grid/grid5.html#DumitrescuRF07