@inproceedings{nd03a,
    author = {Nienhaus, Marc and Döllner, Jürgen},
    booktitle = {Proceedings of SIGGRAPH -- Sketches \& Applications},
    series = {SIGGRAPH '03},
    publisher = {ACM},
    title = {Sketchy Drawings -- A Hardware-Accelerated Approach for Real-Time Non-Photorealistic Rendering},
    year = {2003},
    doi = {10.1145/965400.965478},
}