@article{ref1,
title="Minimum sonic boom shock strengths and overpressures",
journal="Nature",
year="1969",
author="Seebass, R.",
volume="221",
number="5181",
pages="651-653",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0028-0836",
doi="",
url="http://dx.doi.org/"
}