Onur Ferhat, Arcadi Llanza, & Fernando Vilariño. (2015).<a href='http://dx.doi.org/10.1007/978-3-319-19390-8_64''> "A Feature-Based Gaze Estimation Algorithm for Natural Light Scenarios "</a> In _Pattern Recognition and Image Analysis, Proceedings of 7th Iberian Conference , ibPRIA 2015_ (Vol. 9117, pp. 569&ndash;576). Springer International Publishing.