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024 _a11671
037 _cTextual
040 _aSDCL
_cSDCL
_beng
041 _2eng
_aeng
082 _aB2893, K6
100 _aKato Tosio
_9475044
245 0 _aPerturbation theory for linear operators.
260 _c1966
942 _hB2893, K6
_cTEXL
_2CC
999 _c814089
_d814089