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200 1 $aContributions to the theory of nonlinear oscillations$fby H. Antosiewicz... et al.$gedited by S. Lefschatz$v4.
210   $aPrinceton$cPrinceton University press$d1958
215   $aV, 211 p.$cgraf.$d26 cm
225 2 $aAnnals of Mathematics studies$v41
410   $12001$aAnnals of Mathematics studies$v41
610 0 $aEquazioni differenziali nonlineari
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996   $aContributions to the theory of nonlinear oscillations$960518
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