@article{ref1,
title="Determination of barbiturates by automatic differential spectrophotometry",
journal="Clinica chimica acta: international journal of clinical chemistry",
year="1959",
author="Zak, B. and Williams, L. A.",
volume="4",
number="2",
pages="170-174",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0009-8981",
doi="",
url="http://dx.doi.org/"
}