5Farrell M J. The Measurement of Productive Efficiency. Journal of the Royal Statistical Society, 1957.
6Charnes A, Cooper W W, Phodes E.. Measuring the Efficiency of DMU. European Journal of Operational Research, 1978.
7Banker R D, Charnes A, Cooper W W. Some Models for Estimating Technical and Scale Inefficiencies in DEA. Management Science,1984.
8Cummins,D ,M. Weiss, and H. Zi (1998)." Organiational Form and Efficiency: An Analysis of Stock and Mutual Property-Liability Insurers". Working paper, Wharton Financial Institutions Center, University of Pennsylvania, Philadelphia.
9Cummins,D, M. Weiss, and H. Zi (1998). "Organization Form and Efficiency: An Analysis of Stock and Mutual Property-Liability Insurers". Working paper, Wharton Financial Institutions Center,University of Pennsylvania, Philadelphia.
10FARREL M J. The Measurement of Production Efficiency [J]. Journal of Royal Statistical Society, 1957, 130(3) :353 - 381.
