@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/}, }