00352nam a2200109 a 450000500170000008200220001710000200003924500590005926000520011830000220017049000500019220251203090445.0  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