@article {jopera:40, title = {Modeling and Executing Heterogeneous Grid Workflows with JOpera}, author = {Cesare Pautasso and Thomas Heinis}, year = {2005}, month = {5.10.2005}, address = {GGF 15, Boston, USA}, URL = {http://www.isi.edu/~deelman/wfm-rg/}, }