@article {jopera:27, title = {The JOpera Visual Composition Language}, author = {Cesare Pautasso and Gustavo Alonso}, journal = {Journal of Visual Languages and Computing (JVLC)}, volume = {16}, year = {2005}, pages = {119-152}, URL = {http://dx.doi.org/10.1016/j.jvlc.2004.08.004}, }