Go Physics - What is PI?

          @misc{ pirsa_PIRSA:11020171,
            doi = {},
            url = {https://pirsa.org/11020171},
            author = {Epp, Richard},
            keywords = {},
            language = {en},
            title = {Go Physics - What is PI?},
            publisher = {Perimeter Institute},
            year = {2011},
            month = {feb},
            note = {PIRSA:11020171 see, \url{https://pirsa.org}}
          }