@article{ref1,
title="Cannabis: psychological effects of chronic heavy use. A controlled study of intellectual functioning in chronic users of high potency cannabis",
journal="Psychopharmacology",
year="1973",
author="Bowman, M. and Pihl, R. O.",
volume="29",
number="2",
pages="159-170",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0033-3158",
doi="",
url="http://dx.doi.org/"
}