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200 1 $aOn the closure operators of an effectivity function$fStefano Vannucci
210   $aSiena$cUniversità degli Studi di Siena$d1990
215   $a19 p.$d24 cm
225 1 $aQuaderni del Dipartimento di economia politica$fUniversità degli studi di Siena$v103
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996   $aOn the closure operators of an effectivity function$9365502
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