@conference {Zhang:2014:PCM:2598153.2598186,
	title = {Pupil-canthi-ratio: A Calibration-free Method for Tracking Horizontal Gaze Direction},
	booktitle = {Proceedings of the 2014 International Working Conference on Advanced Visual Interfaces},
	series = {AVI {\textquoteright}14},
	year = {2014},
	pages = {129--132},
	publisher = {ACM},
	organization = {ACM},
	address = {New York, NY, USA},
	keywords = {calibration-free, eye tracking, Gaussian regression, gaze-based interaction, pervasive displays, vision-based},
	isbn = {978-1-4503-2775-6},
	doi = {10.1145/2598153.2598186},
	url = {http://doi.acm.org/10.1145/2598153.2598186},
	author = {Zhang, Yanxia and Bulling, Andreas and Gellersen, Hans}
}
