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100   $a20001109d1994----km-y0itay0103----ba
101 0 $aeng
102   $aGE
200 1 $aApproximation procedures in nonlinear oscillation theory$fNikolai A. Bobylev, Yuri M. Burman, Sergey K. Korovin
210   $aBerlin ; New York [etc.]$cWalter de Gruyter$d1994
610 1 $aoperatori non lineari
610 1 $ateoria dell'approssimazione
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700  1$aBobylev,$bNikolai A.$0753591
702  1$aBurman,$bYuri M.
702  1$aKorovin,$bSergey K.
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996   $aApproximation procedures in nonlinear oscillation theory$91516048
997   $aUNISA