@article{hd09,
    author = {Hagedorn, Benjamin and Döllner, Jürgen},
    journal = {it - Information Technology},
    title = {Sketch-Based Navigation in 3D Virtual Environments},
    year = {2009},
    number = {3},
    pages = {163--170},
    doi = {10.1524/itit.2009.0537},
    publisher = {Oldenburger Wissenschaftsverlag},
}