000 00378nam a2200133Ia 4500
008 211228s9999 xx 000 0 und d
040 _cJayakar Knowledge Resource Centre
100 _aFriedrichs, Kurt O
245 0 _aPeturbation of spectra in hilbert space
250 _a1st
260 _bAmerican mathematical society
_aIsland
_c1965
300 _axiii,178p p.
942 _c1
999 _c178229
_d178229