@article{ref1,
title="Heart Period As a Useful Index of Pilot Workload in Commercial Transport Aircraft",
journal="International journal of aviation psychology",
year="1991",
author="Metalis, S.A.",
volume="1",
number="2",
pages="107-116",
abstract="[Abstract unavailable]  <p>Language: en</p>",
language="en",
issn="1050-8414",
doi="10.1207/s15327108ijap0102_2",
url="http://dx.doi.org/10.1207/s15327108ijap0102_2"
}