B. W. Chatters Meir M. Lehman Juan F. Ramil Paul Wernick Modelling a software evolution process: a long-term case study. 91-102 2000 5 Software Process: Improvement and Practice 2-3 db/journals/sopr/sopr5.html#ChattersLRW00 http://onlinelibrary.wiley.com/doi/10.1002/1099-1670(200006/09)5:2/3<91::AID-SPIP123>3.0.CO;2-L/abstract