Positive Energy in Quantum Gravity

          @misc{ pirsa_PIRSA:14050126,
            doi = {10.48660/14050126},
            url = {https://pirsa.org/14050126},
            author = {Smolin, Lee},
            keywords = {},
            language = {en},
            title = {Positive Energy in Quantum Gravity},
            publisher = {Perimeter Institute},
            year = {2014},
            month = {may},
            note = {PIRSA:14050126 see, \url{https://pirsa.org}}
          }