@article{ref1,
title="The Effects of 10 Mgs. of Benzedrine Sulfate and Low Oxygen Tension on the Span of Attention for Letters, and Other Factors",
journal="Journal of psychology, The",
year="1940",
author="Seitz, Clifford P. and Barmack, Joseph Ephraim",
volume="10",
number="2",
pages="241-247",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0022-3980",
doi="10.1080/00223980.1940.9916999",
url="http://dx.doi.org/10.1080/00223980.1940.9916999"
}