J. Jeon, V. Lavrenko, and R. Manmatha. Proceedings of the 26th Annual International ACM SIGIR Conference on Research and Development in Informaion Retrieval, page 119--126. New York, NY, USA, ACM, (2003)
T. Sakata, R. Nishii, T. Chin, and R. Sawae. Frontiers in Handwriting Recognition, 2004. IWFHR-9 2004. Ninth International
Workshop on, page 377--381. IEEE Computer Society, (2004)
R. Jesus, D. Goncalves, A. Abrantes, and N. Correia. Computer Vision and Pattern Recognition Workshops, 2008. CVPR Workshops 2008. IEEE Computer Society Conference on, (June 2008)