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101 0 $aeng
200 1 $aBifurcations of planar vector fields$eNilpotent singularities and abelian integrals$fby F Dumortier, R. Roussarie, J.Sotomajor, H. Zoladek.
210   $aBerlin$cSpringer-Verlag$d1991.
215   $aVIII, 226 p.
225 1 $aLecture Notes in Mathematics$v1480
700  1$aDumortier,$bFreddy$053294
801  0$aIT$bUNINA$gRICA$2UNIMARC
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