@article{ref1,
title="Drug use among youth in Denmark in the spring of 1968. Studies among school pupils and other young persons under training",
journal="Danish medical bulletin",
year="1971",
author="Ulff-Moller, B.",
volume="18",
number="5",
pages="105-111",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0907-8916",
doi="",
url="http://dx.doi.org/"
}