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100   $a20000920d1994----km-y0itay50------ba
101 0 $aeng
200 1 $aUnsolved Problems in Number Theory$fRichard K. Guy
205   $a2nd ed.
210   $aNew York$cSpringer-Verlag$dc1994
215   $axvi, 285 p.$cill.$d24 cm
610 0 $aTeoria dei numeri
676   $a512.7
700  1$aGuy,$bRichard K.$047477
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