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105   $a||||||||001yy
200 1 $a<<Vol. 1:>> Unsolved problems in number theory$fRichard K. Guy
205   $asecond edition
210   $aNew York [etc.]$cSpringer$dcopyr. 1981
215   $aXVIII, 161 p.$d23 cm
410  0$12001
454  1$12001
461  1$10010023912$12001$aUnsolved problems in intuitive mathematics
606 0 $aTeoria dei numeri
676   $a512.7
700  1$aGUY,$bRichard K.$047477
801  0$aITA$bsalbc$gISBD
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996   $aUnsolved problems in number theory$981813
997   $aUNISA