@article{ref1,
title="Human tolerance limits",
journal="Acta psychologica",
year="1950",
author="Bartlett, Sir Frederic",
volume="7",
number="",
pages="133-141",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0001-6918",
doi="10.1016/0001-6918(50)90010-2",
url="http://dx.doi.org/10.1016/0001-6918(50)90010-2"
}