PSI 2015/2016 - Gravitational Physics - Lecture 2

          @misc{ pirsa_PIRSA:16010040,
            doi = {},
            url = {https://pirsa.org/16010040},
            author = {Gregory, Ruth},
            keywords = {},
            language = {en},
            title = {PSI 2015/2016 - Gravitational Physics - Lecture 2},
            publisher = {Perimeter Institute},
            year = {2016},
            month = {jan},
            note = {PIRSA:16010040 see, \url{https://pirsa.org}}
          }