Ruth Breu Radu Grosu Franz Huber Bernhard Rumpe Wolfgang Schwerin Towards a Precise Semantics for Object-Oriented Modeling Techniques. 205-210 1997 conf/ecoopw/1997 ECOOP Workshops http://link.springer.de/link/service/series/0558/bibs/1357/13570205.htm db/conf/ecoopw/ecoopw97.html#BreuGHRS97