@article{RCM_1988__22_1-4_181815,
     author = {Carlos R. Videla},
     title = {On {Root} {Systems.}},
     journal = {Revista colombiana de matematicas},
     pages = {183--192},
     publisher = {mathdoc},
     volume = {22},
     number = {1-4},
     year = {1988},
     zbl = {0689.17008},
     url = {http://geodesic.mathdoc.fr/item/RCM_1988__22_1-4_181815/}
}