@inproceedings{dbnk05,
    author = {Döllner, Jürgen and Buchholz, Henrik and Nienhaus, Marc and Kirsch, Florian},
    booktitle = {Visualization and Data Analysis},
    title = {Illustrative Visualization of 3D City Models},
    year = {2005},
    pages = {42--51},
    publisher = {International Society for Optical Engine (SPIE)},
    series = {Proceedings of the SPIE},
    volume = {5669},
}