Advanced General Relativity - Lecture 12

          @misc{ pirsa_PIRSA:13020028,
            doi = {},
            url = {https://pirsa.org/13020028},
            author = {Sorkin, Rafael},
            keywords = {},
            language = {en},
            title = {Advanced General Relativity - Lecture 12},
            publisher = {Perimeter Institute},
            year = {2013},
            month = {feb},
            note = {PIRSA:13020028 see, \url{https://pirsa.org}}
          }