00333nas a22001217a 4500008004100000022001400041022001400055245005500069260005800124300000700182362000600189650001600195190206s9999    xx            000 0 und d  a1064-5632  a1468-4810  aRussian Academy of Sciences. Izvestiya Mathematics  aProvidence R. I.bAmerican Mathematical Societyc1993  av.  a   aMathematics