By Amman H.M.   Kendrick D.A.   in Economics Letters

ISSN:0165-1765|58|2|185-191

Elsevier‎(1998)‎

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By Amman H.M.   Kendrick D.A.   in Journal of Optimization Theory and Applications

ISSN:0022-3239|105|3|509-520

Springer Publishing Company ‎(2000)‎

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By Amman H.M.   Kendrick D.A.   Achath S.   in Economics Letters

ISSN:0165-1765|48|1|9-13

Elsevier‎(1995)‎

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