00309nas a22001097a 4500008004100000022001500041245005200056260005900108300000700167362000900174650001600183190206s9999    xx            000 0 und d  a1531-8362   aRussian Academy of Science. Doklady Mathematics  aProvidence, R.I.bAmerican Mathematical Society c1993  av.  a1992  aMathematics