00000nam a2200000 a 4500 20251203090445.0 515.724, DD, Ber Berezanskii, M. Expansions in eigen functions of selfadjoint operators Providence American mathematical society 1968 ix, 809p., 22 cm. Translations of mathematical monographs v.17 Operator theory Eng 100 010 _ 19478 LIBSC C 8268 8268 0 0 0 0 PU PU 1998-04-08 0 515.724, DD, Ber 19478 BK