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101 0 $aeng
200 1 $aDegrees of Unsolvability$fby Gerald E. Sacks
210   $aPrinceton [N.J.]$cPrinceton University Press$d1963
215   $aix, 174 p.$d24 cm
225 1 $aAnnals of mathematics studies$v55
610 0 $aLogica
610 0 $aRicorsività
676   $a160
700  1$aSacks,$bGerald E.$050334
801  0$aIT$bUNINA$gRICA$2UNIMARC
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996   $aDegrees of Unsolvability$9340517
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