1. Xie, G., Chen, J., Neamtiu, I.: Towards a better understanding of software evolution: An empirical study on open source software. In: ICSM 2009, pp. 51–60 (2009)
2. Sommerville, I.: Software engineering, 9th edn. Addison Wesley (2010)
3. Parnas, P.L.: Software aging. In: Proceedings of the 16th ICSE, pp. 279–287 (1994)
4. Lehman, M.M., Ramil, J.F., Wernick, P.D., Perry, D.E., Turski, W.M.: Metrics and laws of software evolution – The nineties view. In: Proceedings of the Fourth International Software Metrics Symposium, pp. 20–32 (1997)
5. Lecture Notes in Computer Science;M.M. Lehman,1996