PSI 2015/2016 - Gravitational Physics - Lecture 4

          @misc{ scivideos_PIRSA:16010042,
            doi = {},
            url = {https://pirsa.org/16010042},
            author = {Gregory, Ruth},
            keywords = {},
            language = {en},
            title = {PSI 2015/2016 - Gravitational Physics - Lecture 4},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2016},
            month = {jan},
            note = {PIRSA:16010042 see, \url{https://scivideos.org/index.php/pirsa/16010042}}
          }