Bert Robben Wouter Joosen Frank Matthijs Bart Vanhaute Pierre Verbaeten Components for Non-Functional Requirements. 151-152 http://link.springer.de/link/service/series/0558/bibs/1543/15430151.htm 1998 conf/ecoopw/1998 ECOOP Workshops db/conf/ecoopw/ecoopw98.html#RobbenJMVV98