@article{ref1,
title="Relative annoyance and loudness judgments of various simulated sonic boom waveforms. NASA CR-1192",
journal="NASA contractor report. NASA CR.",
year="1968",
author="Shepherd, L. J. and Sutherland, W. W.",
volume="",
number="",
pages="1-52",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0565-7059",
doi="",
url="http://dx.doi.org/"
}