General Relativity, Black Holes and GPS

          @misc{ scivideos_PIRSA:06070034,
            doi = {},
            url = {https://pirsa.org/06070034},
            author = {Pope, Damian},
            keywords = {},
            language = {en},
            title = {General Relativity, Black Holes and GPS},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2006},
            month = {jul},
            note = {PIRSA:06070034 see, \url{https://scivideos.org/pirsa/06070034}}
          }