1. NEOS Optimization Software Guide, November 2004. Available from: .
2. Mip: Theory and practice—Closing the gap;Bixby,2000
3. Simulation techniques for the sensitivity analysis of multi-criteria decision models;Butler;European Journal of Operational Research,1997
4. Data Envelopment Analysis: Theory, Methodology and Applications;Charnes,1995
5. Symmetry breaking during search in constraint programming;Gent,2000