Ravin Balakrishnan
Thomas Baudel
Gordon Kurtenbach
George Fitzmaurice
Proceedings of the SIGCHI conference on Human factors in computing systems - CHI ’97
An Asymmetric 2D Pointer/3D Ray for 3D Interaction Within Collaborative Virtual Environments
A two-ball mouse affords three degrees of freedom
Overcoming Limitations of the Trackpad for 3D Docking Operations
Mouse 2.0: Multi-touch Meets the Mouse