@inproceedings{hd08,
    author = {Hagedorn, Benjamin and Döllner, Jürgen},
    booktitle = {8th International Symposium on Smart Graphics 2008},
    title = {Sketch-Based Navigation in 3D Virtual Environments},
    year = {2008},
    pages = {239--246},
    publisher = {Springer},
    series = {Lecture Notes in Computer Science},
}