Gravitational Physics Lecture - 230109

          @misc{ pirsa_PIRSA:23010030,
            doi = {},
            url = {https://pirsa.org/23010030},
            author = {Gregory, Ruth},
            keywords = {},
            language = {en},
            title = {Gravitational Physics Lecture - 230109},
            publisher = {Perimeter Institute},
            year = {2023},
            month = {jan},
            note = {PIRSA:23010030 see, \url{https://pirsa.org}}
          }