By Gradstein M.   in Economics Letters

ISSN:0165-1765|61|2|229-234

Elsevier‎(1998)‎

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By Gradstein M.   Justman M.   in Economics Letters

ISSN:0165-1765|47|3|393-400

Elsevier‎(1995)‎

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By Justman M.   Gradstein M.   in Explorations in Economic History

ISSN:0014-4983|36|2|109-127

Academic Press‎(1999)‎

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