01035nam0-22003491i-450 99000131458040332120190410111518.00-387-97491-1000131458FED01000131458(Aleph)000131458FED0100013145820000920d1991----km-y0itay50------baengAlgebraic methods in nonlinear perturbation theoryV. N. Bogaevski, A. PovznerNew York [etc.]Springer-Verlag1991XII, 265 p.7 ill., 24 cmApplied mathematical sciences88Teoria della perturbazione515.35Bogaevski,Vladimir Nikolaevich350414Povzner,A.ITUNINARICAUNIMARCBK990001314580403321C-33-(888404MA160 D 116172FINBNFINBNMA1Algebraic methods in nonlinear perturbation theory347870UNINAING01