@article{ref1,
title="Amphetamine and barbiturate effects on two tasks performed singly and in combination",
journal="Acta psychologica",
year="1976",
author="Truijens, C. L. and Trumbo, D. A. and Wagenaar, W. A.",
volume="40",
number="3",
pages="233-244",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0001-6918",
doi="",
url="http://dx.doi.org/"
}