@article{AMBP_2022__29_1_99_0,
     author = {Katsura, Takeshi and Ogawa, Masahito and Takeuchi, Airi},
     title = {On the magic square {C*-algebra} of size 4},
     journal = {Annales math\'ematiques Blaise Pascal},
     pages = {99--148},
     publisher = {Universit\'e Clermont Auvergne, Laboratoire de math\'ematiques Blaise Pascal},
     volume = {29},
     number = {1},
     year = {2022},
     doi = {10.5802/ambp.408},
     language = {en},
     url = {http://archive.numdam.org/articles/10.5802/ambp.408/}
}