@inproceedings{dh07,
    author = {Döllner, Jürgen and Hagedorn, Benjamin},
    booktitle = {Urban and Regional Data Management: UDMS 2007 Annual},
    title = {Integrating Urban GIS, CAD, and BIM Data By Service-Based Virtual 3D City-Models},
    year = {2007},
    pages = {157--170},
    publisher = {Taylor \& Francis Ltd},
}