01075nam--2200349---450-99000325987020331620090529131306.0000325987USA01000325987(ALEPH)000325987USA0100032598720090529d1969----km-y0itay50------baengUSa---||||001yyPerturbation theory of eigenvalue problemsFranz Rellichassisted by J. BerkowitzNew YorkGordon and Breach1969X, 127 p.ill.23 cmNotes on mathematics and its applications20012001Notes on mathematics and its applicationsTeoria spettrale515.722RELLICH,Franz57700BERKOWITZ,J.ITsalbcISBD990003259870203316515.722 REL4116/CBS515.72200222028BKSCIRSIAV79020090529USA011313Perturbation theory of eigenvalue problems384804UNISA