By Rees A.   Hardy G.E.   Barkham M.   Howells P.   Hussein K.   in Economics Letters

ISSN:0165-1765|55|3|371-377

Elsevier‎(1997)‎

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By Biefang-Frisancho Mariscal I.   Howells P.G.A.   in International Review of Applied Economics

ISSN:1465-3486|26|1|97-110

Routledge Ltd‎(2012)‎

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