@article{ref1,
title="Residual levels of DDT in children of rural and urban zones",
journal="Boletín médico del Hospital Infantil de México",
year="1975",
author="Schvartsman, S. and Menezes de Mello, A. and Ribeiro de Mello, N. and Martins Filho, J.",
volume="32",
number="3",
pages="451-455",
abstract="<p>[Abstract unavailable]</p><p>Language: es</p>",
language="es",
issn="0539-6115",
doi="",
url="http://dx.doi.org/"
}