@article{ref1,
title="Devices for recording and evaluating pavement roughness",
journal="Highway Research Board bulletin",
year="1960",
author="Hveem, F. N.",
volume="264",
number="",
pages="1-26",
abstract="All types of devices to measure pavement roughness from 1900 to 1960 are described. These devices include all types of profilometers, profilographs, and road roughness indicators used in several U.S. states and France, Germany, and Canada.<p />",
language="",
issn="0073-2206",
doi="",
url="http://dx.doi.org/"
}