@article{MS2_1965__16_165907,
     author = {Peter Scherk},
     title = {On {Sets} of {Vectors.}},
     journal = {Mathematica Scandinavica},
     pages = {38--40},
     publisher = {mathdoc},
     volume = {16},
     year = {1965},
     zbl = {0138.01002},
     url = {http://geodesic.mathdoc.fr/item/MS2_1965__16_165907/}
}