@article {jopera:30,
	title = {JOpera: a Toolkit for Efficient Visual Composition of Web Services},
	author = {Cesare Pautasso and Gustavo Alonso},
	journal = {International Journal of Electronic Commerce (IJEC)},
	volume = {9},
	year = {2004},
	month = {Winter 2004/2005},
	pages = {107-141},
	keywords = {Scalable Process Execution, Visual Programming Languages, Web Service Composition},
	URL = {http://www.gvsu.edu/business/ijec/v9n2/},
}