@article{MZ_1954__60_169434,
     author = {Hans Ludwig de Vries},
     title = {\"Uber {Riemannsche} {R\"aume,} die infinitesimale konforme {Transformationen} gestatten.},
     journal = {Mathematische Zeitschrift},
     pages = {328--347},
     publisher = {mathdoc},
     volume = {60},
     year = {1954},
     zbl = {0056.15203},
     url = {http://geodesic.mathdoc.fr/item/MZ_1954__60_169434/}
}