P. Abrahamsson, и J. Koskela. Empirical Software Engineering, 2004. ISESE '04. Proceedings. 2004 International Symposium on, стр. 73--82. (августа 2004)
F. Amirjavid, A. Bouzouane, и B. Bouchard. Proceedings of the 19th International Conference on Conceptual Structures (ICCS 2011), том 6828 из Lecture Notes in Computer Science, стр. 353-356. Springer, (2011)
C. Bangal, M. Mangare, P. Babar, и P. Tungar. International Journal on Recent and Innovation Trends in Computing and Communication, 3 (4):
1975--1978(апреля 2015)