@article{ref1,
title="Programmed safety through programmed learning",
journal="Human factors",
year="1973",
author="Leslie, J. H. Jr and Adams, S. K.",
volume="15",
number="3",
pages="223-236",
abstract="<p>[Abstract unavailable]</p> <p>Language: en</p>",
language="en",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}