@article{ref1,
title="Use habits among adults of cigarettes, coffee, aspirin, and sleeping pills",
journal="Vital and health statistics 10",
year="1979",
author="Bonham, G. S. and Leaverton, P. E.",
volume="",
number="131",
pages="1-48",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0083-1972",
doi="",
url="http://dx.doi.org/"
}