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Ying Huang and  Zhiliang Wang and  An Ping,  Non-contact Gaze Tracking with Head Movement Adaptation based on Single Camera.   journal   = {International Journal of Computer, Electrical, Automation, Control and Information Engineering}, [online]. World Academy of Science, Engineering and Technology. November 2009, vol. 35(11). 2568 - 2571[viewed 21 March 2018]. Available from: http://waset.org/publications/10887.