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PORTUGALIAEMATHEMATICA Vol. 52, No. 1, pp. 1-14 (1995)  | 
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The Mathematician Hugo RibeiroJorge AlmeidaGrupo de Matemática Pura, Faculdade de Ciências do Porto,4050 Porto - PORTUGAL Full text of the article: 
 Electronic version published on: 29 Mar 2001. This page was last modified: 27 Nov 2007. 
© 1995 Sociedade Portuguesa de Matemática
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