@article{ref1,
title="Marijuana in Vietnam. A survey of use among Army enlisted men in the two southern corps",
journal="International journal of the addictions",
year="1970",
author="Roffman, R. A. and Sapol, E.",
volume="5",
number="1",
pages="1-42",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0020-773X",
doi="",
url="http://dx.doi.org/"
}