X. Shen, B. Tan, and C. Zhai. Proceedings of the 28th annual international ACM SIGIR conference on Research and development in information retrieval, page 43--50. New York, NY, USA, ACM, (2005)
D. Giordano, I. Kavasidis, C. Pino, and C. Spampinato. Proceedings of the Symposium on Eye Tracking Research and Applications, page 369--372. New York, NY, USA, ACM, (2012)
Y. Zhang, H. Fu, Z. Liang, Z. Chi, and D. Feng. Proceedings of the 2010 Symposium on Eye-Tracking Research &\#38; Applications, page 37--40. New York, NY, USA, ACM, (2010)