@inproceedings{kratz2010trackballrear,
 author = {Kratz, Sven and Rohs, Michael},
 title = {Extending the Virtual Trackball Metaphor to Rear Touch Input},
 booktitle = {Proceedings of the 2010 IEEE Symposium on 3D User Interfaces (3DUI 2010)},
 year = {2010},
 month = mar
 isbn = {978-1-4244-6846-1},
 location = {Waltham, MA, USA},
 pages = {111-114},
 url = {http://dx.doi.org/10.1109/3DUI.2010.5444712},
 doi = {10.1109/3DUI.2010.5444712},
 publisher = {IEEE},
 keywords = {Virtual trackball, 3D user interfaces, 3D touch input},
}