Day DL, AY Lewin and H Li (1995). “Strategic Leaders or Strategic Groups: A Longitudinal Data Envelopment Analysis of the U.S. Brewing Industry.” EJOR 80(3): 619-638.
Day DL, AY Lewin and H Li (1995). “Strategic Leaders or Strategic Groups: A Longitudinal Data Envelopment Analysis of the U.S. Brewing Industry.” EJOR 80(3): 619-638.