@article{ref1,
title="A general feedback theory of human behavior: part i",
journal="Perceptual and motor skills",
year="1960",
author="Powers, W. T. and Clark, R. K. and Mc Farland, R. L.",
volume="11",
number="1",
pages="71-88",
abstract="<p>[Abstract unavailable]</p>",
language="en",
issn="0031-5125",
doi="10.2466/pms.1960.11.1.71",
url="http://dx.doi.org/10.2466/pms.1960.11.1.71"
}