@article{ref1,
title="Transportation",
journal="Gerontologist",
year="1972",
author="Byerts, T. and Guillemard, A. M. and Leeds, M. and Gertman, J. and Lawton, M. P. and Rajic, R.",
volume="12",
number="2",
pages="11-16",
abstract="Abstract unavailable.",
language="",
issn="0016-9013",
doi="",
url="http://dx.doi.org/"
}