@inproceedings{kd10b,
    author = {Klimke, Jan and Döllner, Jürgen},
    booktitle = {Sixth International Conference, GIScience 2010, Zürich, Switzerland, Sep. 14-17 2010, Proceedings},
    title = {Combining Synchronous and Asynchronous Collaboration within 3D City Models},
    year = {2010},
    number = {6292},
    publisher = {Springer},
    series = {LNCS},
}