@article{MZ_1921__10_167641,
     author = {K., Kommerell},
     title = {Klassifikation der {Raumkorrelationen}},
     journal = {Mathematische Zeitschrift},
     pages = {217--230},
     publisher = {mathdoc},
     volume = {10},
     year = {1921},
     zbl = {48.0691.02},
     url = {http://geodesic.mathdoc.fr/item/MZ_1921__10_167641/}
}