@article{MZ_1983__183_173341,
     author = {Arnold Neumaier},
     title = {On {Norm} {Three} {Vectors} in {Integral} {Euclidean} {Lattices.} {I.}},
     journal = {Mathematische Zeitschrift},
     pages = {565--574},
     publisher = {mathdoc},
     volume = {183},
     year = {1983},
     zbl = {0496.10018},
     url = {http://geodesic.mathdoc.fr/item/MZ_1983__183_173341/}
}