Chang HH and R Mashruwala (2006). “Was the Bell System a Natural Monopoly? An Application of Data Envelopment Analysis.” Ann Oper Res 145: 251-263.

Chang HH and R Mashruwala (2006). “Was the Bell System a Natural Monopoly? An Application of Data Envelopment Analysis.” Ann Oper Res 145: 251-263.

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