@article{ref1,
title="Flying on scheduled airlines--United States, Canada, and Western Europe",
journal="Statistical Bulletin (Met. Life)",
year="1977",
author="",
volume="58",
number="",
pages="2-4",
abstract="<p>[Abstract unavailable]</p><p>Language: en</p>",
language="en",
issn="0026-1513",
doi="",
url="http://dx.doi.org/"
}