1. Managing a legacy system;Alan;CAD User,1997
2. Orthogonal zig-zag: an algorithm for vectorising engineering drawings compared with Hough transform;Dori;Advances in Engineering Software,1997
3. R.G. Casey, K.Y. Wong, Document analysis systems and techniques, in: R. Kasturi, M.M. Trivedi (Eds.), Image Analysis Applications, Marcel Dekker, New York, 1990.
4. S.N. Srihari, G.M. Zack, Document image analysis, in: Proceedings of the 8th ICPR, Paris, 1986, pp. 434–436.
5. J. Montagne, Making GIS Conversion Easier, American City & County, Vol. 9, August 1992, p. 107.