Yiannis Kanellopoulos Christos Tjortjis Ilja Heitlager Joost Visser Interpretation of Source Code Clusters in Terms of the ISO/IEC-9126 Maintainability Characteristics. 63-72 2008 CSMR http://dx.doi.org/10.1109/CSMR.2008.4493301 conf/csmr/2008 db/conf/csmr/csmr2008.html#KanellopoulosTHV08