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200 1 $aQualitative theory of differential equations$fV.V. Nemytskii, V.V. Stepanov
210   $aPrinceton$cPrinceton university press$d1960
215   $aVIII, 523 p.$cill.$d23 cm
225 2 $aPrinceton mathematical series$v22
410  1$1001000333101$12001$aPrinceton mathematical series$v22
606 0 $aEquazioni differenziali
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996   $aQualitative theory of differential equations$91011641
997   $aUNISA