ACM - affordances
Ravin Balakrishnan
George Fitzmaurice
Gordon Kurtenbach
William Buxton
Proceedings of the 12th annual ACM symposium on User interface software and technology - UIST ’99
Touch-sensing input devices
Two-handed input in a compound task
Addison Wesley
The design of a GUI paradigm based on tablets, two-hands, and transparency
Manual and cognitive benefits of two-handed input: an experimental study
Attention and visual feedback
Is paper safer? The role of paper flight strips in air traffic control
TUI-Geometry: A Tangible User Interface for Geometric Drawing on an Interactive Tabletop