@article{MAN_1959__138_160715,
     author = {H. MAASS},
     title = {\"Uber die r\"aumliche {Verteilung} der {Punkte} in {Gittern} mit indefiniter {Metrik.}},
     journal = {Mathematische Annalen},
     pages = {287--315},
     publisher = {mathdoc},
     volume = {138},
     year = {1959},
     zbl = {0089.06102},
     url = {http://geodesic.mathdoc.fr/item/MAN_1959__138_160715/}
}