Relativity - Lecture 4

          @misc{ scivideos_PIRSA:12090022,
            doi = {},
            url = {https://pirsa.org/12090022},
            author = {Duff, Michael},
            keywords = {},
            language = {en},
            title = {Relativity - Lecture 4},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2012},
            month = {sep},
            note = {PIRSA:12090022 see, \url{https://scivideos.org/pirsa/12090022}}
          }