@article{ref1,
title="Symptoms of hallucinogen and opiate use and withdrawal syndrome",
journal="Wiener Medizinische Wochenschrift",
year="1981",
author="Ladewig, D.",
volume="131",
number="5",
pages="115-118",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="de",
issn="0043-5341",
doi="",
url="http://dx.doi.org/"
}