@article{ref1,
title="Hard and soft hallucinogenic drug users: their drug taking patterns and objectives",
journal="International journal of the addictions",
year="1973",
author="Scherer, S. E.",
volume="8",
number="5",
pages="755-766",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0020-773X",
doi="",
url="http://dx.doi.org/"
}