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100   $a20000920d1962----km-y0itay50------ba
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200 1 $aAsymptotic Approximations$fBy Harold Jeffreys
210   $aOxford$cClarendon Press$d1962
215   $a144 p.$d22 cm
610 0 $aEquazioni differenziali e integro$aDifferenziali
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