Explorations in Quantum Gravity - Lecture 12

          @misc{ pirsa_PIRSA:12040035,
            doi = {},
            url = {https://pirsa.org/12040035},
            author = {Rovelli, Carlo},
            keywords = {Quantum Gravity},
            language = {en},
            title = {Explorations in Quantum Gravity - Lecture 12},
            publisher = {Perimeter Institute},
            year = {2012},
            month = {apr},
            note = {PIRSA:12040035 see, \url{https://pirsa.org}}
          }