@article{ref1,
title="The traffic, the basis of cosmopolitan-city development",
journal="Zeitschrift des Vereines Deutscher Ingenieure",
year="1911",
author="Blum, ",
volume="55",
number="",
pages="58-62",
abstract="<p>[Abstract unavailable]</p><p>Language: de</p>",
language="",
issn="0341-7255",
doi="",
url="http://dx.doi.org/"
}