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200 1 $aBuilding internet firewalls$fD. Brent Chapman, Elizabeth D. Zwicky
210   $aSebastopol [Ca.]$cO'Reilly$dc1995
215   $axxvi, 517 p.$cill.$d24 cm
225 1 $aInternet security
300   $aminor corrections, november 1995
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610 0 $aSistemi di sicurezza
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701  1$aZwicky,$bElizabeth D.$062497
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