Lavanya Ramakrishnan Dennis Gannon Beth Plale WORKEM: Representing and Emulating Distributed Scientific Workflow Execution State. 283-292 2010 CCGRID http://dx.doi.org/10.1109/CCGRID.2010.89 conf/ccgrid/2010 db/conf/ccgrid/ccgrid2010.html#RamakrishnanGP10