@article{ELMA_1959__14_140693,
     author = {Peter Wilker},
     title = {\"Uber den {Vektor.}},
     journal = {Elemente der Mathematik},
     pages = {27--37},
     year = {1959},
     volume = {14},
     zbl = {0086.36002},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1959__14_140693/}
}