A study of chiral symmetry in quenched QCD using the Overlap-Dirac   operator
  We compute fermionic observables relevant to the study of chiral symmetry in quenched QCD using the Overlap-Dirac operator for a wide range of the fermion mass. We use analytical results to disentangle the contribution from exact zero modes and simplify our numerical computations. Details concerning the numerical implementation of the Overlap-Dirac operator are presented. 
Robert G. Edwards, Urs M. Heller and Rajamani Narayanan