Ramez Elmasri. Conecptual Modeling Using and Extended E-R Model (Abstract). In Guy M. Lohman, AmÃlcar Sernadas, Rafael Camps, editors, 17th International Conference on Very Large Data Bases, September 3-6, 1991, Barcelona, Catalonia, Spain, Proceedings. pages 67, Morgan Kaufmann, 1991. [doi]
Abstract is missing.