@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 }