String Theory Review - Lecture 6

          @misc{ pirsa_PIRSA:11020056,
            doi = {},
            url = {https://pirsa.org/11020056},
            author = {Cachazo, Freddy},
            keywords = {},
            language = {en},
            title = {String Theory Review - Lecture 6},
            publisher = {Perimeter Institute},
            year = {2011},
            month = {feb},
            note = {PIRSA:11020056 see, \url{https://pirsa.org}}
          }