Advanced General Relativity - Lecture 3

          @misc{ pirsa_PIRSA:13010013,
            doi = {},
            url = {https://pirsa.org/13010013},
            author = {Sorkin, Rafael},
            keywords = {},
            language = {en},
            title = {Advanced General Relativity - Lecture 3},
            publisher = {Perimeter Institute},
            year = {2013},
            month = {jan},
            note = {PIRSA:13010013 see, \url{https://pirsa.org}}
          }