@article{ref1,
title="Human factors in urban transportation systems",
journal="Human factors",
year="1975",
author="Adams, S. K. and Hoag, L. L.",
volume="17",
number="2",
pages="119-131",
abstract="Abstract unavailable.",
language="",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}