Tohidi G, GR Jahanshahloo, FH Lotfi, N Shoja and S Razavyan (2005). “Undesirable Inputs and Outputs in DEA Models.” Appl Math Comput 169(2): 917-925.

Tohidi G, GR Jahanshahloo, FH Lotfi, N Shoja and S Razavyan (2005). “Undesirable Inputs and Outputs in DEA Models.” Appl Math Comput 169(2): 917-925.

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