R. J. Jacob and K. S. Karn, Eye Tracking in Human-Computer Interaction and Usability Research, pp.573-605, 2003.
DOI : 10.1016/B978-044451020-4/50031-1

T. Pfeiffer, Measuring and visualizing attention in space with 3D attention volumes, Proceedings of the Symposium on Eye Tracking Research and Applications, ETRA '12, pp.29-36, 2012.
DOI : 10.1145/2168556.2168560
URL : http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.352.1531

L. Stellmach, R. Nacke, and . Dachselt, 3D attentional maps, Proceedings of the International Conference on Advanced Visual Interfaces, AVI '10, pp.345-348, 2010.
DOI : 10.1145/1842993.1843058

S. Stellmach, L. Nacke, R. Dachselt, and C. Lindley, Trends and Techniques in Visual Gaze Analysis, Proceedings of The 5th Conference on Communication by Gaze Interaction -COGAIN 2009: Gaze Interaction For Those Who Want It Most, pp.89-93, 2009.

S. Moritz, Service Design, practical access to an evolving field, London. Koln International School of Design, 2005.

T. Pfeiffer, Tracking and Visualizing Visual Attention in Real 3D Space, Proceedings of the KogWis 2010, pp.220-221, 2010.

O. Spakov and D. Miniotas, Visualization of Eye Gaze Data using Heat Maps. Electronica and electrical engineering, pp.55-58, 2007.

B. M. Velichkovsky and J. P. Hansen, New technological windows into mind, Proceedings of the SIGCHI conference on Human factors in computing systems common ground, CHI '96, pp.496-503, 1996.
DOI : 10.1145/238386.238619

T. Pfeiffer, Understanding Multimodal Deixis with Gaze and Gesture in Conversational Interfaces, Berichte aus der Informatik. Shaker Verlag, 2011.