@article{ALCO_2021__4_2_329_0,
     author = {Nomura, Kazumasa and Terwilliger, Paul},
     title = {Idempotent systems},
     journal = {Algebraic Combinatorics},
     pages = {329--357},
     publisher = {MathOA foundation},
     volume = {4},
     number = {2},
     year = {2021},
     doi = {10.5802/alco.159},
     language = {en},
     url = {https://alco.centre-mersenne.org/articles/10.5802/alco.159/}
}