Amplitudes: Spinor Helicity

          @misc{ scivideos_PIRSA:15070045,
            doi = {10.48660/15070045},
            url = {https://pirsa.org/15070045},
            author = {Kosower, David},
            keywords = {Particle Physics},
            language = {en},
            title = {Amplitudes: Spinor Helicity},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2015},
            month = {jul},
            note = {PIRSA:15070045 see, \url{https://scivideos.org/index.php/pirsa/15070045}}
          }