Isabel Michiels Alejandro Fernández Jürgen Börstler Maximo Prieto Tools and Environments for Understanding Object-Oriented Concepts. 65-77 2000 conf/ecoopw/2000 ECOOP Workshops http://link.springer.de/link/service/series/0558/bibs/1964/19640065.htm db/conf/ecoopw/ecoopw2000.html#MichielsFBP00