Mikhail Perepletchikov Caspar Ryan Keith Frampton Zahir Tari Coupling Metrics for Predicting Maintainability in Service-Oriented Designs. 329-340 2007 ASWEC http://doi.ieeecomputersociety.org/10.1109/ASWEC.2007.17 conf/aswec/2007 db/conf/aswec/aswec2007.html#PerepletchikovRFT07