@article{MZ_1927__26_167955,
     author = {J., A. Schouten},
     title = {\"Uber n-fache {Orthogonalsysteme} in {V?}},
     journal = {Mathematische Zeitschrift},
     pages = {706--730},
     publisher = {mathdoc},
     volume = {26},
     year = {1927},
     zbl = {53.0685.03},
     url = {http://geodesic.mathdoc.fr/item/MZ_1927__26_167955/}
}