Charnes A, WW Cooper, M Sears and S Zlobec (1991). “Efficiency Evaluations in Perturbed Data Envelopment Analysis.” in Guddat J, HT Jongen, B Kummer and F Nozicka (eds.) Mathematical Research: Proceedings of the Second: 38-49.
Charnes A, WW Cooper, M Sears and S Zlobec (1991). “Efficiency Evaluations in Perturbed Data Envelopment Analysis.” in Guddat J, HT Jongen, B Kummer and F Nozicka (eds.) Mathematical Research: Proceedings of the Second: 38-49.