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200 1 $aQualitative theory of planar differential systems$fF. Dumortier, J. Llibre, J. C. Artes
210   $aBerlin$cSpringer$dc2006
215   $axvi, 298 p.$d24 cm
225 1 $aUniversitext
610 0 $aTeoria qualitativa
610 0 $aSystemi dinamici lisci
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996   $aQualitative theory of planar differential systems$9726504
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