1. Wong KY, Casey RG, Wahl FM (1982) Document analysis system. IBM J Res Dev 26(6): 647–656
2. Ittner DJ, Baird HS (1993) Language-free layout analysis. In: Proceedings of the second ICDAR, Tsukuba, pp 336–340
3. O’Gorman L (1993) The document spectrum for page layout analysis. IEEE Trans PAMI 15(11):1162–1172
4. Kise K, Iwata M, Matsumoto K, Dengel A (1998) A computational geometric approach to text-line extraction from binary document images. In: Proceedings of the 3rd DAS, Nagano, pp 346–355
5. Baird HS (1992) Anatomy of a versatile page reader. Proc IEEE 80(7):1059–1065