Franck Barbier Brian Henderson-Sellers Annig Le Parc Jean-Michel Bruel Formalization of the Whole-Part Relationship in the Unified Modeling Language. 459-470 2003 29 IEEE Trans. Software Eng. 5 http://www.computer.org/tse/ts2003/e0459abs.htm db/journals/tse/tse29.html#BarbierHPB03