00941nam0 2200265 450 00002213720090128104051.020090128g19501960km-y0itay50------baengUSy-------001yyContributions to the theory of nonlinear oscillationsedited by S. LefschetzPrinceton (N. J.)Princeton university press1950-1960v.23-26 cmAnnals of mathematics studies2001Annals of mathematics studiesContributions to the theory of nonlinear oscillations60518Oscillazioni515.35419Equazioni differenziali lineariLefschetz,Solomon<1884-1972>070ITUNIPARTHENOPE20090128RICAUNIMARC000022137216/42331NAVA2Contributions to the theory of nonlinear oscillations60518UNIPARTHENOPE