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title = {{Defining Composition Operators for {BPMN}}},  booktitle = {Software Composition},  }  @inproceedings{Henderson-Sellers06,  author = {Henderson-Sellers, Brian},  booktitle = {ISTA},  editor = {Karagiannis, Dimitris and Mayr, Heinrich C.},  ee = {http://subs.emis.de/LNI/Proceedings/Proceedings84/article4300.html},  isbn = {3-88579-178-1},  pages = {13-23},  publisher = {GI},  series = {LNI},  title = {{Method Engineering: Theory and Practice.}},  url = {http://dblp.uni-trier.de/db/conf/ista/ista2006.html#Henderson-Sellers06},  volume = {84},  year = {2006},  }