@article{ref1,
title="Discrimination of increases in the brightness of a flashing beacon. NASA CR-1220",
journal="NASA contractor report. NASA CR.",
year="1968",
author="Lincoln, R. S. and Seidenstein, S. and Juliano, C. V.",
volume="",
number="",
pages="1-42",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0565-7059",
doi="",
url="http://dx.doi.org/"
}