By Mendonça Helder Ferreira de   Pires Manoel Carlos de Castro   in Journal of Economic Studies

ISSN:0144-3585|37|3|327-342

Emerald Group Publishing Ltd‎(2010)‎

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By de Mendonça Helder Ferreira   Pires Manoel Carlos de Castro   in Applied Economics Letters

ISSN:1466-4291|14|7|483-487

Routledge Ltd‎(2007)‎

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