Mikhail Perepletchikov Caspar Ryan Keith Frampton Cohesion Metrics for Predicting Maintainability of Service-Oriented Software. 328-335 2007 QSIC http://doi.ieeecomputersociety.org/10.1109/QSIC.2007.21 conf/qsic/2007 db/conf/qsic/qsic2007.html#PerepletchikovRF07