Zieschang KD and CAK Lovell (1994). “The Problem of New and Disappearing Commodities in the Construction of Price Indexes.” in Charnes A, WW Cooper, AY Lewin and LM Seiford (eds.) Data Envelopment Analysts: Theory, Methodology, and Applications, Kluwer: 353-367.

Zieschang KD and CAK Lovell (1994). “The Problem of New and Disappearing Commodities in the Construction of Price Indexes.” in Charnes A, WW Cooper, AY Lewin and LM Seiford (eds.) Data Envelopment Analysts: Theory, Methodology, and Applications, Kluwer: 353-367.

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