@article{ref1,
title="Testing sonic booms",
journal="Nature",
year="1967",
author="Clark, Roseanne",
volume="215",
number="5106",
pages="1122-1123",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0028-0836",
doi="",
url="http://dx.doi.org/"
}