Katja Hölttä-Otto Olivier de Weck Degree of Modularity in Engineering Systems and Products with Technical and Business Constraints. 113-126 2007 15 Concurrent Engineering: R&A 2 http://cer.sagepub.com/cgi/content/abstract/15/2/113 db/journals/cera/cera15.html#Holtta-OttoW07