@article{ref1,
title="A study of mental fatigue",
journal="British journal of psychology (1904)",
year="1913",
author="Martyn, Gladys W.",
volume="5",
number="4",
pages="427-446",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0950-5652",
doi="10.1111/j.2044-8295.1913.tb00073.x",
url="http://dx.doi.org/10.1111/j.2044-8295.1913.tb00073.x"
}