Identification of circles from datapoints using Gaussian sums
  We present a pattern recognition method which use datapoints on a plane and estimates the parameters of a circle. MC data are generated in order to test the method's efficiency over noise hits, uncertainty in the hits positions and number of datapoints. The scenario were the hits from a quadrant of the circle are missing is also considered. The method proposed is proven to be robust, accurate and very efficient. 
T. Alexopoulos, G. Iakovidis, S. Leontsinis, K. Ntekas, V.   Polychronakos
physics.ins-det hep-ex