Gravitational Physics Lecture - 230208

          @misc{ pirsa_PIRSA:23020009,
            doi = {},
            url = {https://pirsa.org/23020009},
            author = {Gregory, Ruth},
            keywords = {},
            language = {en},
            title = {Gravitational Physics Lecture - 230208},
            publisher = {Perimeter Institute},
            year = {2023},
            month = {feb},
            note = {PIRSA:23020009 see, \url{https://pirsa.org}}
          }