PSI 2018/2019 - Gravitational Physics - Lecture 11

          @misc{ pirsa_PIRSA:19020020,
            doi = {},
            url = {https://pirsa.org/19020020},
            author = {Gregory, Ruth},
            keywords = {},
            language = {en},
            title = {PSI 2018/2019 - Gravitational Physics - Lecture 11},
            publisher = {Perimeter Institute},
            year = {2019},
            month = {feb},
            note = {PIRSA:19020020 see, \url{https://pirsa.org}}
          }