4Charnes A. ,Cooper W. W, Rhodes E.. 1978. Measuring the efficiency of decision making units[J]. European Journal of Operational Research, Vol. 2, No. 6:429-444.
5Charnes A, Cooper W W. Programming with linear fractional function[J]. Naval Research Logistics Quarterly, 1962,9: 181- 185.
6Charnes A. Optimality and degeneracy in linear programming [J]. Econometrica, 1952, 20:160-170.
7Charnes .A. and Cooper W. W. Management models and industrial applications of linear programming(1), (2)[M]. John Wiley and Sons, INC. New York and London, 1961.