@article{ref1,
title="How do bisphosphonates prevent fractures?",
journal="Annals of the rheumatic diseases",
year="1997",
author="Tobias, J. H.",
volume="56",
number="9",
pages="510-511",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0003-4967",
doi="",
url="http://dx.doi.org/"
}