Entani T, H Ichihashi and H Tanaka (2001). “Estimation in DEA by Possibility Regression with the Upper and Lower Approximations.? in Proceedings Joint 9th Ifsa World Congress and 20th Nafips International Conference IEEE. 5: 2718-2723.

Entani T, H Ichihashi and H Tanaka (2001). “Estimation in DEA by Possibility Regression with the Upper and Lower Approximations.? in Proceedings Joint 9th Ifsa World Congress and 20th Nafips International Conference IEEE. 5: 2718-2723.

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