@article{10_21136_CPM_1986_118283,
     author = {C{\'\i}rulis, J\'anis},
     title = {Betweenness spaces and tree algebras},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {340--344},
     publisher = {mathdoc},
     volume = {111},
     number = {4},
     year = {1986},
     doi = {10.21136/CPM.1986.118283},
     mrnumber = {871711},
     zbl = {0616.05031},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1986.118283/}
}