Flat space Limit

          @misc{ scivideos_PIRSA:09110139,
            doi = {},
            url = {https://pirsa.org/09110139},
            author = {Penedones, Joao},
            keywords = {},
            language = {en},
            title = {Flat space Limit},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2009},
            month = {nov},
            note = {PIRSA:09110139 see, \url{https://scivideos.org/pirsa/09110139}}
          }