1. M. Jorgensen, “Contrasting ideal and realistic conditions as a means to improve judgment-based software development effort estimation”, Information and Software Technology, Vol. 53, Issue 12, pp. 1382–1390, Elsevier B.V, December 2011.
2. Martin Shepperd, Chris Schofield and Barbara Kitchenham “Effort Estimation using Analogy”, IEEE, 2009.
3. Deng. J “Introduction to grey system”, Journal of Grey System, Vol. 1 No. 1, pp. 1–24. 1989.
4. Qinbao Song, Martin Shepperd and Carolyn Mair, “Using Grey Relational Analysis to Predict Software Effort with Small Data Sets”, 11th IEEE International Software Metrics Symposium—METRICS 2005.
5. Sun-Jen Huang, Nan-Hsing Chiu and Li-Wei Chen, “Integration of the grey relational analysis with genetic algorithm for software effort estimation”, European Journal of Operational Research, pp 898–909, 2008.