@article{ref1,
title="A human factors approach to the assessment of the mobility of blind pedestrians",
journal="Human factors",
year="1978",
author="Foulke, E. and Shingledecker, Clark A.",
volume="20",
number="3",
pages="273-286",
abstract="Abstract unavailable.",
language="",
issn="0018-7208",
doi="",
url="http://dx.doi.org/"
}