Miguel A. Pérez Pedro J. Clemente 12th Workshop for PhD Students in Object Oriented Systems. 44-54 2002 conf/ecoopw/2002 ECOOP Workshops http://link.springer.de/link/service/series/0558/bibs/2548/25480044.htm db/conf/ecoopw/ecoopw2002.html#PerezC02