Tutorial 2

          @misc{ pirsa_PIRSA:23040106,
            doi = {10.48660/23040106},
            url = {https://pirsa.org/23040106},
            author = {Shpitser, Ilya},
            keywords = {Quantum Foundations},
            language = {en},
            title = {Tutorial 2},
            publisher = {Perimeter Institute},
            year = {2023},
            month = {apr},
            note = {PIRSA:23040106 see, \url{https://pirsa.org}}
          }