1. Mohamed A.O., Perreira Da Silva M., Courbolay V., A history of eye gaze tracking (2007), http://hal.archives-ouvertes.fr/docs/00/21/59/67/PDF/Rapport_interne_1.pdf (March 12, 2010)
2. Applied Science Group, Eye Tracking System Instructions. ASL Eye-Trac 6000, Pan Tilt/Optics (2006)
3. Duchowski, A.T.: A Breadth-First Survey of Eye Tracking Applications, http://brm.psychonomic-journals.org/content/34/4/455.full.pdf (March13,2010)
4. Duchowski, A.T.: Eye tracking methodology: Theory and practice, pp. 205–300. Springer, London (2003)
5. Information about Dasher project, http://www.inference.phy.cam.ac.uk/dasher/DasherSummary2.html