Day DL, AY Lewin and HY Li (1995). “Strategic Leaders or Strategic Groups – a Longitudinal Data Envelopment Analysis of the United-States Brewing Industry.” EJOR 8: 619-638.

Day DL, AY Lewin and HY Li (1995). “Strategic Leaders or Strategic Groups – a Longitudinal Data Envelopment Analysis of the United-States Brewing Industry.” EJOR 8: 619-638.

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