String Theory Review - Lecture 13

          @misc{ pirsa_PIRSA:11030006,
            doi = {},
            url = {https://pirsa.org/11030006},
            author = {Cachazo, Freddy},
            keywords = {},
            language = {en},
            title = {String Theory Review - Lecture 13},
            publisher = {Perimeter Institute},
            year = {2011},
            month = {mar},
            note = {PIRSA:11030006 see, \url{https://pirsa.org}}
          }