Pieter Bekaert Geert Delanote Frank Devos Eric Steegmans Specialization/Generalization in Object-Oriented Analysis: Strengthening and Multiple Partitioning. 34-43 2002 conf/oois/2002w OOIS Workshops http://link.springer.de/link/service/series/0558/bibs/2426/24260034.htm db/conf/oois/oois2002w.html#BekaertDDS02