Looking for Instanton-induced Processes at HERA Using a Multivariate   Technique Based on Range Searching
  We present a method to discriminate instanton-induced processes from standard DIS background based on Range Searching. This method offers fast and automatic scanning of a large number of variables for a combination of variables giving high signal to background ratio and the smallest theoretical and experimental uncertainties. 
T. Carli, B. Koblitz