Nuno Jardim Nunes Marco Toranzo João Falcão e Cunha Jaelson Castro Srdjan Kovacevic Dave Roberts Jean-Claude Tarby Mark Collins-Cope Mark van Harmelen Interactive System Design and Object Models. 267-287 http://link.springer.de/link/service/series/0558/bibs/1743/17430267.htm 1999 conf/ecoopw/1999 ECOOP Workshops db/conf/ecoopw/ecoopw99.html#NunesTCCKRTCH99