@article{ref1,
title="Observed daytime seat-belt use in Vancouver before and after the British Columbia belt-use law",
journal="Canadian journal of public health",
year="1979",
author="Robertson, Leon S. and Williams, Allan F.",
volume="70",
number="5",
pages="329-331",
abstract="Abstract unavailable",
language="",
issn="0008-4263",
doi="",
url="http://dx.doi.org/"
}