Emrouznejad, A., G. R. Amin, et al. (2010). “On the boundedness of the SORM DEA models with negative data.” European Journal of Operational Research 206(1): 265-268.

Emrouznejad, A., G. R. Amin, et al. (2010). “On the boundedness of the SORM DEA models with negative data.” European Journal of Operational Research 206(1): 265-268.

Emrouznejad et al. (2010) proposed a Semi-Oriented Radial Measure (SORM) model for assessing the efficiency of Decision Making Units (DMUs) by Data Envelopment Analysis (DEA) with negative data. This paper provides a necessary and sufficient condition for boundedness of the input and output oriented SORM models.

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Emrouznejad, A., G. R. Amin, et al. (2010). “On the boundedness of the SORM DEA models with negative data.” European Journal of Operational Research 206(1): 265-268. .
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