Gazing and Frowning as a New Human-Computer Interaction Technique. Surakka, V., Illi, M., & Isokoski, P. ACM Transactions on Applied Perception, 1(1):1-17, ACM Press, 2004.
Gazing and Frowning as a New Human-Computer Interaction Technique [link]Paper  bibtex   
@article{surakka2004,
author="Veikko Surakka and Marko Illi and Poika Isokoski",
title="Gazing and Frowning as a New Human-Computer Interaction Technique",
journal="ACM Transactions on Applied Perception",
publisher="ACM Press",
year="2004",
volume=1,
number=1,
pages="1-17",
url="http://dl.acm.org/authorize?713189",
}

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