@article{ref1,
title="Concerning pulse rate increments of helicopter pilots as a measurement of their stress",
journal="Zentralblatt für Verkehrs-Medizin, Verkehrs-Psychologie, Luft- und Raumfahrt-Medizin",
year="1968",
author="Koetz, H",
volume="14",
number="",
pages="65-70",
abstract="Helicopter pilot pulse rate increments during flight maneuvers as measurement of stress noting age, flying experience and vegetative excitability.<p />",
language="",
issn="0044-4286",
doi="",
url="http://dx.doi.org/"
}