@article{ref1,
title="Study on vehicle operating costs",
journal="Transport and communications bulletin for Asia and the Pacific",
year="1987",
author="No Author(s) Listed, ",
volume="",
number="59",
pages="25-49",
abstract="Operating costs (by cost category and speed) for cars, buses, mini-buses and trucks on paved, unimproved and shingle roads.<p />",
language="",
issn="0252-4392",
doi="",
url="http://dx.doi.org/"
}