@article{ref1,
title="The instructional system approach to maintenance technical training: development and implementation model",
journal="Human factors",
year="1966",
author="Nunnelly, C. L. and Klemmer, A. G. and Corrigan, R. E. and Kaufman, R. A.",
volume="8",
number="2",
pages="163-172",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}