@article{ref1,
title="A method for the detection of drugs at therapeutic dosages in human urine using adsorption column chromatography and thin-layer chromatography",
journal="Clinica chimica acta: international journal of clinical chemistry",
year="1972",
author="Hetland, L. B. and Knowlton, D. A. and Couri, D.",
volume="36",
number="2",
pages="473-478",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0009-8981",
doi="",
url="http://dx.doi.org/"
}