Dyckhoff H and K Allen (2001). “Measuring Ecological Efficiency with Data Envelopment Analysis (DEA).” EJOR 132(2): 312-325.

Duan YR, P Tian and WP Zhang (2005). “Relative Efficiency Analysis of Complex System Based on Data Envelopment Analysis.” J Shanghai Jiaotong University 39(3): 433-436.

Dufour C, P Lanoie and M Patry (1998). “Regulation and Productivity.” JPA 9(3): 233-247.

Dula JH (1994). “Geometry of Optimal Value Functions with Applications to Redundancy in Linear Programming.” J Optimization Theory and Applications 81(1): 35-52.

Dula JH (1997). “Equivalences between Data Envelopment Analysis and the Theory of Redundancy in Linear Systems.” EJOR 101(1): 51-64.

Dula JH and RV Helgason (1996). “A New Procedure for Identifying the Frame of the Convex Hull of a Finite Collection of Points in Multidimensional Space.” EJOR 92(2): 352-367.

Dula JH and BL Hickman (1997). “Effects of Excluding the Column Being Scored from DEA Envelopment LP Technology Matrix.” JORS 48(10): 1001-1012.

Dula JH and BL Hickman (1997). “Effects of Excluding the Column Being Scored from the DEA Envelopment LP Technology Matrix.” JORS 48(10): 1001-1012.

Drake L and R Simper (2002). “X-Efficiency and Scale Economies in Policing: A Comparative Study Using the Distribution Free Approach and DEA.” Appl Econ 34(15): 1859-1870.

Dula JH and RM Thrall (2001). “A Computational Framework for Accelerating DEA.” JPA 16(1): 63-78.