Christian Bird Peter C. Rigby Earl T. Barr David J. Hamilton Daniel M. Germán Premkumar T. Devanbu The promises and perils of mining git. 1-10 2009 MSR http://dx.doi.org/10.1109/MSR.2009.5069475 conf/msr/2009 db/conf/msr/msr2009.html#BirdRBHGD09