@article{ref1,
title="Sibling social structure and oral behavior; drinking and smoking in adolescence",
journal="Quarterly journal of studies on alcohol",
year="1972",
author="Zucker, R. A. and Van Horn, H.",
volume="33",
number="1",
pages="193-197",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0033-5649",
doi="",
url="http://dx.doi.org/"
}