Oliver Schreer Peter Eisert Peter Kauff Ralf Tanger Roman Englert Towards Robust Intuitive Vision-Based User Interfaces. 69-72 2006 conf/icmcs/2006 ICME http://doi.ieeecomputersociety.org/10.1109/ICME.2006.262552 db/conf/icmcs/icme2006.html#SchreerEKTE06