Counsell, Ellie and Hassoun, Y. and Johnson, R. and Mannock, Keith and Mendes, E. (2003) Trends in Java code changes: the key to identification of refactorings? In: Power, J.F. and Waldron, W. (eds.) Proceedings of the 2nd International Symposium on Principles and Practice of Programming in Java: PPPJ 2003. International Conference Proceeding Series 42. ACM, pp. 45-48. ISBN 9780954414511.