1. T. M. Breuel. Two algorithms for geometric layout analysis. In Proceedings of the Workshop on Document Analysis Systems, Princeton, NJ, USA, 2002
2. B. Gatos, N. Papamarkos, C. Chamzas, "Skew Detection and Text Line Position Determination in Digitized Documents", Pattern Recognittion, vol. 30 pp. 1505-1519, 1997
3. Ávila B.T., Lins R.D., "A Fast Orientation and Skew Detection Algorithm for Monochromatic Document Images".