Y. Ke, X. Tang, and F. Jing. Proceedings of the 2006 IEEE Computer Society Conference on Computer Vision and Pattern Recognition - Volume 1, page 419--426. Washington, DC, USA, IEEE Computer Society, (2006)
K. Lo, K. Liu, and C. Chen. Computer Vision - ACCV 2012 Workshops, volume 7729 of Lecture Notes in Computer Science, Springer Berlin Heidelberg, (2013)