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2. R.O. Duda and P.E. Hart, “Use of the Hough Transformation to Detect Lines and Curves in Pictures”, Commun. ACM, Vol. 15, No. 1, (1972), p. 11 ff.
3. P.V.C. Hough, “Method and Means for Recognizing Complex Patterns”, US Patent No. 3,069,654, (1962).
4. L.G. Roberts, “Machine Perception of Three-Dimensional Solids”, Optical and Electro-Optical Inf. Proc., MIT press, (1965), pp. 159–197.
5. A. Rosenfeld, chapter 8.4, pp.151: “Coordinate Conversion”, in A. Rosenfeld “Picture Processing by Computer”, Academic Press, (1969).