@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/},
}