Relativity - Lecture 14

          @misc{ pirsa_PIRSA:12090036,
            doi = {},
            url = {https://pirsa.org/12090036},
            author = {Duff, Michael},
            keywords = {},
            language = {en},
            title = {Relativity - Lecture 14},
            publisher = {Perimeter Institute},
            year = {2012},
            month = {sep},
            note = {PIRSA:12090036 see, \url{https://pirsa.org}}
          }