@article{ref1,
title="Passenger Flow in Subways",
journal="OR: Operational research quarterly (1953)",
year="1958",
author="Hankin, B. D. and Wright, Richard A.",
volume="9",
number="2",
pages="81-88",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="1473-2858",
doi="",
url="http://dx.doi.org/"
}