000 00313pam a2200121a 44500
010 _a60012712
082 _a530.15082
_bSU64L V.3
100 _aFriedrichs. Kurt O.
245 1 _aPERTURBATION OF SPECTRA IN HILBERT SPACE
260 _a
_bAmerican Mathematical Society
_c1965
964 _gCIRC
997 _aK6089 C
999 _c380657
_d380657