@inproceedings{mjd07a,
    author = {Maass, Stefan and Jobst, Markus and Döllner, Jürgen},
    booktitle = {23rd International Cartographic Conference},
    title = {Use of Depth Cues for the Annotation of 3D Geo-Virtual Environments},
    year = {2007},
    note = {CD proceedings},
}