@article{ref1,
title="Survey on psychological influence of friends riding together on driver focus",
journal="Japanese journal of traffic psychology",
year="2016",
author="Imai, Yasuo and Renge, Kazumi",
volume="32",
number="1",
pages="18-27",
abstract="<p>[Abstract unavailable]</p>",
language="ja",
issn="0910-9749",
doi="",
url="http://dx.doi.org/"
}