000 004340000a22001570004500
008 140223b1991 xxu||||| |||| 00| 0 eng d
041 _aENG
080 _aB321 N1
082 _aB321 N1
100 _aBOGAEVSKI (V N)
700 _aPOVZNER (A)
245 _aAlgebraic methods in nonlinear perturbation theory.
260 _aNew York
_bSpringer-Verlag
_c1991
440 _aApplied Mathematical sciences 88
650 _aDIFFERENTIAL
999 _c253503
_d253503