Exact results and approximation schemes for the Schwinger model with the   overlap Dirac operator
  We propose new techniques to implement numerically the overlap-Dirac operator which exploit the physical properties of the underlying theory to avoid nested algorithms. We test these procedures in the two-dimensional Schwinger model and the results are very promising. We also present a detailed computation of the spectrum and chiral properties of the Schwinger Model in the overlap lattice formulation. 
L. Giusti, C. Hoelbling and C. Rebbi