000 00272nam a2200109 4500
008 160616s 000 0
245 _aPerturbation of spectra in hilbert space
100 _aFriedrichs, K.O
500 _aB313N K52
942 _cBK
_2BK4755
080 _a513.882 FRI
999 _c4755
_d4755