00557nam a2200169 a 450000500170000008200220001710000200003924500590005926000520011830000220017049000500019269000200024296400250026299700180028799900150030595200670032020251203090445.0  a515.724,bDD, Ber  aBerezanskii, M.  aExpansions in eigen functions of selfadjoint operators  aProvidencebAmerican mathematical societyc1968  aix, 809p., 22 cm.  aTranslations of mathematical monographsdv.17  aOperator theory  bEngc100de010fg_  a19478 LIBSC C  c8268d8268  00104070aPUbPUd1998-04-08l0o515.724, DD, Berp19478yBK