Aida K, WW Cooper, JT Pastor and T Sueyoshi (1998). “Evaluating Water Supply Services in Japan with Ram: A Range-Adjusted Measure of Inefficiency.” Omega 26(2): 207-232.

Aida K, WW Cooper, JT Pastor and T Sueyoshi (1998). “Evaluating Water Supply Services in Japan with Ram: A Range-Adjusted Measure of Inefficiency.” Omega 26(2): 207-232.

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