Sueyoshi T, H Machida, M Sugiyama, T Arai and Y Yamada (1997). “Privatization of Japan National Railways: DEA Time Series Approaches.” J Oper Res Soc JPN 40(2): 186-205.

Sueyoshi T, H Machida, M Sugiyama, T Arai and Y Yamada (1997). “Privatization of Japan National Railways: DEA Time Series Approaches.” J Oper Res Soc JPN 40(2): 186-205.

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