@article{ref1,
title="Health and social problems of the 4th world",
journal="Anales de la Real Academia Nacional de Medicina",
year="1985",
author="Piédrola Gil, G.",
volume="102",
number="3",
pages="247-270",
abstract="<p>[Abstract unavailable]</p><p>Language: es</p>",
language="es",
issn="0034-0634",
doi="",
url="http://dx.doi.org/"
}