Unitarity Methods

          @misc{ scivideos_PIRSA:11080015,
            doi = {10.48660/11080015},
            url = {https://pirsa.org/11080015},
            author = {Roiban, Radu},
            keywords = {},
            language = {en},
            title = {Unitarity Methods},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2011},
            month = {aug},
            note = {PIRSA:11080015 see, \url{https://scivideos.org/index.php/pirsa/11080015}}
          }