@article{ref1,
title="Traffic, the basis of the development of cosmopolitan cities",
journal="Zeitschrift des Vereines Deutscher Ingenieure",
year="1911",
author="Blum, ",
volume="55",
number="",
pages="7-11",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="",
issn="0341-7255",
doi="",
url="http://dx.doi.org/"
}