Elaine H. Ferneley Design Metrics as an Aid to Software Maintenance: An Empirical Study. 55-72 1999 11 Journal of Software Maintenance 1 http://dx.doi.org/10.1002/(SICI)1096-908X(199901/02)11:1<55::AID-SMR184>3.0.CO;2-O db/journals/smr/smr11.html#Ferneley99