@article{MZ_1989__201_4_174047,
     author = {H.P. Schlickewei and Wolfgang M. Schmidt},
     title = {Isotrope {Unterr\"aume} rationaler quadratischer {Formen.}},
     journal = {Mathematische Zeitschrift},
     pages = {191--208},
     publisher = {mathdoc},
     volume = {201},
     number = {4},
     year = {1989},
     zbl = {0645.10020},
     url = {http://geodesic.mathdoc.fr/item/MZ_1989__201_4_174047/}
}