SciELO - Scientific Electronic Library Online

SciELO - Scientific Electronic Library Online

Automatic translation using Windows Live Translator and Google Translator service
This is an automatic translation that represents a best effort but it was not reviewed by the author and might have imperfections.

Perguntas - São Paulo. DELTA [online]. 1997, vol.13, n.spe, pp. 157-163. ISSN 0102-4450.  http://dx.doi.org/10.1590/S0102-44501997000300006.

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