00375nam a2200121Ia 450000500170000000800410001702000150005805000190007310000200009224500840011226000260019665000310022220251229190646.0251229s9999    xx            000 0 und d  a0521383188  aQC 20.7.S3N87   aNussenzveig,H.M 0aDiffraction effects in semi classical scattering/H.M.NussenzveigcM Nussenzveig  aCambridge pressb1992  aNon-Associat Iv E Algebras