@article{ref1,
title="Air-fluid levels in the left lower thorax following a fall",
journal="Chest",
year="1972",
author="Wilkov, H. R.",
volume="62",
number="5",
pages="621-622",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0012-3692",
doi="",
url="http://dx.doi.org/"
}