@inproceedings{toennis2009svrRotationDevices,
  author    = {T\"{o}nnis, Marcus and Echtler, Florian and Huber, Manuel and Klinker, Gudrun},
  title     = {{Low Cost 3D Rotational Input Devices: the stationary Spinball and the mobile Soap3D}},
  booktitle =    {{Proceedings of the 11th Symposium on Virtual and Augmented Reality (SVR)}},
  month     = may,
  year      = 2009
}