1. Method and means for recognising complex patterns;Hough,1962
2. Use of the Hough transformation to detect lines and curves in pictures;Duda;Comm. Assoc. Comput. Mach.,1972
3. Finding circles by an array of accumulators;Kimme;Comm. Assoc. Comput. Mach.,1975
4. Detection of ellipses by a modified Hough transform;Tsuji;IEEE Trans. Computers,1978
5. Generalising the Hough transform to detect arbitrary shapes;Ballard;Pattern Recogn.,1981