@article{10_4153_CMB_2018_038_5,
     author = {Moore, Justin Tatch},
     title = {Nonexistence of {Idempotent} {Means} on {Free} {Binary} {Systems}},
     journal = {Canadian mathematical bulletin},
     pages = {577--581},
     year = {2019},
     volume = {62},
     number = {3},
     doi = {10.4153/CMB-2018-038-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2018-038-5/}
}