Rosen D, C Schaffnit and JC Paradi (1998). “Marginal Rates and Two-Dimensional Level Curves in DEA.” JPA 9(3): 205-232 MAY.

Rosen D, C Schaffnit and JC Paradi (1998). “Marginal Rates and Two-Dimensional Level Curves in DEA.” JPA 9(3): 205-232 MAY.

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