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Appa, Gautam and Yue, M. (2000) A reply to Zhu: how useful or accurate is this alternative? Journal of the Operational Research Society, 51 (3). p. 379. ISSN 0160-5682
Appa, Gautam and Yue, M. (1999) On setting scale efficient targets in DEA. Journal of the Operational Research Society, 50 (1). pp. 60-69. ISSN 0160-5682