By Flores R.G.   Szafarz A.   in Economics Letters

ISSN:0165-1765|50|2|193-195

Elsevier‎(1996)‎

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By de Athayde G.M.   Flores R.G.   in Journal of Economic Dynamics and Control

ISSN:0165-1889|28|7|1335-1352

Elsevier‎(2004)‎

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