1. ABBYY FineReader®. http://finereader.abbyy.com/, 2007.
2. Balasubramanian, A., Meshesha, M., Jawahar, C.V. Retrieval form document image collections. In: Proceedings of the DAS2006, 2006, pp. 1–12.
3. The indexing and retrieval of document images: a survey;Doermann;Computer Vision and Image Understanding,1998
4. Edwards, J., Teh,Y.W., Forsyth, D., Bock, R., Maire, M., Vesom, G. Making Latin manuscripts searchable using gHMM’s. In: Proceedings of the 18th Annual Conference on Neural Information Processing Systems, Cambridge, USA, 2004, pp. 385–392.
5. Ishitani, Y.Model-based information extraction method tolerant of OCR errors for document images. In: Proceedings of the Sixth International Conference on Document Analysis and Recognition, Seattle, USA, 2001, pp. 908–915.