** Carlo Rovelli, Quantum Gravity, Cambridge University Press ( 2004 ); draft available online
** Carlo Rovelli, Quantum Gravity, Cambridge University Press ( 2004 ); draft available online
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** Carlo Rovelli, Quantum Gravity, Cambridge University Press ( 2004 ); draft available online
** Carlo Rovelli, Quantum Gravity, Cambridge University Press ( 2004 ); draft available online
0.003 seconds.