@article{10_4153_S0008439518000140,
     author = {M\"uhlherr, Bernhard and Weiss, Richard M.},
     title = {Tits {Triangles}},
     journal = {Canadian mathematical bulletin},
     pages = {583--601},
     year = {2019},
     volume = {62},
     number = {3},
     doi = {10.4153/S0008439518000140},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/S0008439518000140/}
}