00340nam a2200121Ia 450000500170000000800410001702000150005805000170007310000190009024500530010926000350016265000210019720251229190657.0251229s9999    xx            000 0 und d  a0198535783  aQA 326 .H45   aHelemskii, A.Y 0aBanach and locally convex algebras.cA Helemskii  aOxfordb Clarendon pressc1993  aBanach Algebras.