Marcel F. van Amstel Christian F. J. Lange Michel R. V. Chaudron Four Automated Approaches to Analyze the Quality of UML Sequence Diagrams. 415-424 2007 conf/compsac/2007 COMPSAC (2) http://doi.ieeecomputersociety.org/10.1109/COMPSAC.2007.119 db/conf/compsac/compsac2007-2.html#AmstelLC07