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

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

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