1. Detection of linear oblique structures and skew scan in digitized documents;Postl,1986
2. The skew angle of printed documents;Baird,1987
3. Automated entry system for printed documents;Akiyama;Pattern Recognition,1990
4. Analysis of textual images using the Hough transform;Srihari;Machine Vision and Applications,1989
5. A document skew detection method using run length encoding and the Hough transform;Hinds,1990