1. Use of the Hough transform to detect lines and curves in pictures;Duda;Communs Ass. comput. Mach.,1975
2. Method and means for recognizing complex patterns;Hough,1962
3. A parallel mechanism for detecting curves in pictures;Merlin;IEEE Trans. Comput.,1975
4. Finding picture edges through collinearity of feature points;O'Gorman,1973
5. Finding circles by an array of accumulators;Kimme;Communs Ass. comput. Mach.,1975