@article{ref1,
title="Patterns of use of alcohol, cannabis and tobacco in a student population",
journal="British journal of addiction to alcohol and other drugs",
year="1975",
author="Einstein, R. and Hughes, I. E. and Hindmarch, I.",
volume="70",
number="2",
pages="145-150",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0007-0890",
doi="",
url="http://dx.doi.org/"
}