Some issues in quantum gravity

          @misc{ pirsa_PIRSA:08100033,
            doi = {10.48660/08100033},
            url = {https://pirsa.org/08100033},
            author = {Barbour, Julian},
            keywords = {Quantum Gravity},
            language = {en},
            title = {Some issues in quantum gravity},
            publisher = {Perimeter Institute},
            year = {2008},
            month = {sep},
            note = {PIRSA:08100033 see, \url{https://pirsa.org}}
          }