@article{ref1,
title="Metropolitan transport networks: the case of Randstad, Holland",
journal="IATSS research",
year="1994",
author="Nijkamp, Peter and Oosterman, A",
volume="18",
number="1",
pages="52-61",
abstract="<p>[Abstract unavailable]</p>",
language="",
issn="0386-1112",
doi="",
url="http://dx.doi.org/"
}