@article{ref1,
title="Diagnostic ultrasound: seeing with sound",
journal="Radiography",
year="1972",
author="Shofner, O. E.",
volume="38",
number="452",
pages="198-200",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0033-8281",
doi="",
url="http://dx.doi.org/"
}