@article{ref1,
title="Tentative method to investigate the presence of residual marihuana in the hands of addicts, peddlers and pushers",
journal="Revista ecuatoriana de higiene y medicina tropical",
year="1969",
author="Guerrero Losada, P. A. and Avilez Lasprillas, J.",
volume="26",
number="1",
pages="21-24",
abstract="<p>[Abstract unavailable]</p><p>Language: es</p>",
language="es",
issn="0013-0745",
doi="",
url="http://dx.doi.org/"
}