George A. Tsihrintzis Maria Virvou Efthymios Alepis Ioanna-Ourania Stathopoulou Towards Improving Visual-Facial Emotion Recognition through Use of Complementary Keyboard-Stroke Pattern Information. 32-37 2008 ITNG http://doi.ieeecomputersociety.org/10.1109/ITNG.2008.152 conf/itng/2008 db/conf/itng/itng2008.html#TsihrintzisVAS08