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200 1 $aContributions to the theory of nonlinear oscillations$fedited by S. Lefschetz
210   $aPrinceton (N. J.)$cPrinceton university press$d1950-1960
215   $av.$d23-26 cm
225 2 $aAnnals of mathematics studies
410  0$12001$aAnnals of mathematics studies
500 10$aContributions to the theory of nonlinear oscillations$960518
610 1 $aOscillazioni
676   $a515.354$v19$9Equazioni differenziali lineari
702  1$aLefschetz,$bSolomon$f<1884-1972>$4070
801  0$aIT$bUNIPARTHENOPE$c20090128$gRICA$2UNIMARC
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996   $aContributions to the theory of nonlinear oscillations$960518
997   $aUNIPARTHENOPE