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Elsevier‎(1995)‎

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By Calcagnini G.   Saltari E.   in Economics Letters

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Elsevier‎(2001)‎

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By Grigioni M.   Daniele C.   D'Avenio G.   Calcagnini G.   Barbaro V.   in Wear

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Elsevier‎(1999)‎

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