@inbook{Kolbe_2009,
title={Representing and Exchanging 3D City Models with CityGML},
ISBN={9783540873952},
ISSN={1863-2351},
url={http://dx.doi.org/10.1007/978-3-540-87395-2_2},
DOI={10.1007/978-3-540-87395-2_2},
booktitle={3D Geo-Information Sciences},
publisher={Springer Berlin Heidelberg},
author={Kolbe,
Thomas H.},
year={2009},
pages={15–31} }