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100   $a20030120d2000----km-y0itay50------ba
101 0 $aeng
102   $aNL
105   $aa---a---001yy
200 1 $aComputable structures and the hyperarithmetical hierarchy$fC. J. Ash, J. F. Knight
210   $aAmsterdam$cElsevier$dc2000
215   $axv, 346 p.$d24 cm
225 1 $aStudies in logic and the foundations of mathematics$v144
610 0 $aTeoria delle numerazioni
610 0 $aTeoria dei modelli
676   $a511.3$v21
700  1$aAsh,$bC. J.$067028
701  1$aKnight,$bJames Thomson$057965
801  0$aIT$bUNINA$gRICA$2UNIMARC
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996   $aComputable structures and the hyperarithmetical hierarchy$9377248
997   $aUNINA