Peter Knauber Jesús Bermejo Muñoz Günter Böckle Julio Cesar Sampaio do Prado Leite Frank van der Linden Linda M. Northrop Michael Stark David M. Weiss Quantifying Product Line Benefits. 155-163 2001 conf/pfe/2001 PFE http://link.springer.de/link/service/series/0558/bibs/2290/22900155.htm db/conf/pfe/pfe2001.html#KnauberBBLLNSW01