01015nam--2200361---450-99000330520020331620090901092922.00-19-851952-4000330520USA01000330520(ALEPH)000330520USA0100033052020090901d1981----km-y0itay50------baengGBy---||||001yyQuantum gravity 2a second symposiumC.J. Isham, R. Penrose, D.W. Sciama (Eds.)OxfordClarendon press1981XIV, 669 p.24 cmGravitàCongressi1980Teoria dei quantiCongressi1980531.5ISHAM,C.J.PENROSE,R.SCIAMA,D.W.ITsalbcISBD990003305200203316531.5 QUA6648/CBS531.500326630BKSCIRSIAV79020090901USA010929Quantum gravity 21121766UNISA