@inbook {187, title = {Discrimination of Gaze Directions using Low-level Eye Image Features}, booktitle = {Proceedings of the 1st international workshop on pervasive eye tracking 38; mobile eye-based interaction}, series = {PETMEI {\textquoteright}11}, year = {2011}, pages = {9-14}, publisher = {ACM}, organization = {ACM}, isbn = {978-1-4503-0930-1}, author = {Yanxia Zhang and Andreas Bulling and Hans Gellersen} }