Christian Bird Nachiappan Nagappan Premkumar T. Devanbu Harald Gall Brendan Murphy Does distributed development affect software quality?: an empirical case study of Windows Vista. 85-93 2009 52 Commun. ACM 8 http://doi.acm.org/10.1145/1536616.1536639 db/journals/cacm/cacm52.html#BirdNDGM09