@article{ref1,
title="Preventive medicine, social medicine and health education, fundamental bases in the teaching of hygiene and public health",
journal="Medicina tropical, la",
year="1961",
author="Piédrola Gil, G.",
volume="37",
number="",
pages="139-177",
abstract="<p>[Abstract unavailable]</p> <p>Language: es</p>",
language="es",
issn="0025-7958",
doi="",
url="http://dx.doi.org/"
}