1. The indexing and retrieval of document images: a survey;Doermann;Comput. Vision Image Understanding,1998
2. Handbook of Character Recognition and Document Image Analysis,1997
3. Document Image Analysis;O’ Gorman,1995
4. A robust algorithm for text string separation from mixed text/graphics images;Fletcher;IEEE Trans. Pattern Anal. Mach. Intell.,1988
5. J.L. Fisher, S.C. Hinds, D.P. D’Amato, Rule-based system for document image segmentation, in: Proceedings of the 10th International Conference on Pattern Recognition, 1990, pp. 567–572.