PSI 2019/2020 - Gravitational Physics - Lecture 2

          @misc{ pirsa_PIRSA:20010046,
            doi = {},
            url = {https://pirsa.org/20010046},
            author = {Gregory, Ruth},
            keywords = {Quantum Gravity, Strong Gravity},
            language = {en},
            title = {PSI 2019/2020 - Gravitational Physics - Lecture 2},
            publisher = {Perimeter Institute},
            year = {2020},
            month = {jan},
            note = {PIRSA:20010046 see, \url{https://pirsa.org}}
          }