Explorations in Quantum Gravity - Lecture 11

          @misc{ pirsa_PIRSA:12040034,
            doi = {},
            url = {https://pirsa.org/12040034},
            author = {Rovelli, Carlo},
            keywords = {Quantum Gravity},
            language = {en},
            title = {Explorations in Quantum Gravity - Lecture 11},
            publisher = {Perimeter Institute},
            year = {2012},
            month = {apr},
            note = {PIRSA:12040034 see, \url{https://pirsa.org}}
          }