A preliminary evaluation of head and facial feature tracking for input on mobile devices, In Proc. Proceedings of the 11th International Conference on Human-Computer Interaction with Mobile Devices and Services, Bonn, Germany. ACM, 80. DOI: https://doi.org/10.1145/1613858.1613952.. 2009.
Monitoring of Facial Characteristic Movement for the Control of Mobile Devices: Issues and Recommendations, In Proc. 12th International Conference on Human-Computer Interaction, Beijing, China. Springer... 2007.