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200 1 $aQuantum Gravity$ean Oxford sumposium, february 15-16, 1974
210   $aOxford$cClarendon Press$d1975
702  1$aIsham,$bChris J.
702  1$aPenrose,$bRoger$f<1931- >
702  1$aSciama,$bDennis William$f<1928- >
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