To be necessarily precise... or precisely necessary?

Bibliographic Details
Main Author: Luis David Castiel
Format: Article
Language:English
Published: Escola Nacional de Saúde Pública, Fundação Oswaldo Cruz
Series:Cadernos de Saúde Pública
Online Access:http://www.scielosp.org/scielo.php?script=sci_arttext&pid=S0102-311X2001000400005&lng=en&tlng=en