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100   $a20000920d1982----km-y0itay50------ba
101 0 $aeng
200 1 $aQuantum Structure of Space and Time$eProceedings of the Nuffield workshop, Imperial College, London 3-21 August, 1981$fEdited by M.J. Duff and C.J. Isham
210   $aCambridge$cCambridge University Press$d1982
610 0 $aRelatività
610 0 $aGravità
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700  1$aDuff,$bM.J.$0346120
702  1$aIsham,$bChris J.
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