@article{ref1,
title="Origin of child vagrancy in bogota. Vagrancy as the main cause of offences against society",
journal="Revista Colombiana de Pediatría y Puericultura",
year="1963",
author="Leon, H.",
volume="21",
number="",
pages="19-40",
abstract="<p>[Abstract unavailable]</p><p>Language: es</p>",
language="es",
issn="0120-0402",
doi="",
url="http://dx.doi.org/"
}