Andrea Capiluppi Alvaro E. Faria Juan F. Ramil Exploring the Relationship between Cumulative Change and Complexity in an Open Source System. 21-29 2005 conf/csmr/2005 CSMR http://csdl.computer.org/comp/proceedings/csmr/2005/2304/00/23040021abs.htm db/conf/csmr/csmr2005.html#CapiluppiFR05