@article{ref1,
title="En Route Air Traffic Controllers' Use of Flight Progress Strips: A Graph-Theoretic Analysis",
journal="International journal of aviation psychology",
year="1993",
author="Vortac, O. U. and Edwards, Mark B. and Jones, Judi P. and Manning, Christine A. and Rotter, Allen J.",
volume="3",
number="4",
pages="327-343",
abstract="[Abstract unavailable]  <p>Language: en</p>",
language="en",
issn="1050-8414",
doi="10.1207/s15327108ijap0304_6",
url="http://dx.doi.org/10.1207/s15327108ijap0304_6"
}