@article{ref1,
title="Betel chewing in ceylon",
journal="American journal of tropical medicine and hygiene",
year="1973",
author="Senewiratne, B. and Uragoda, C. G.",
volume="22",
number="3",
pages="418-422",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0002-9637",
doi="",
url="http://dx.doi.org/"
}