Title : Numerical Methods for  Scattering Problems
                by Curved Gratings at High Frequencies

Authors :  H. Ammari  and P. Ferreira

Publi: Math. Meth. Appl. Sci.

Abstract:
A new Numerical method is derived for the calculation of high frequency
asymptotic
expansions of the scalar wave scattered by curved    periodic structures.
Optimal error
estimates for this method are established.