00365nas a22001337a 4500008004100000022001300041022001300054245002600067260005100093300000700144362000900151650001600160856005500176190206s9999    xx            000 0 und d  a10645632  a14684810  aIzvestiya Mathematics  aBristolbInstitute of Physics Publishingc1983  av.  a1967  aMathematics  uhttp://iopscience.iop.org/journal/1064-5632y1967+