Andrzej Jodlowski Piotr Habela Jacek Plodzien Kazimierz Subieta Dynamic Object Roles -- Adjusting the Notion for Flexible Modeling. 449-456 2004 conf/ideas/2004 IDEAS http://doi.ieeecomputersociety.org/10.1109/IDEAS.2004.22 db/conf/ideas/ideas2004.html#JodlowskiHPS04