@article{MOMA_1974__78_186331,
     author = {Peter Gruber},
     title = {\"Uber kennzeichnenede {Eigenschaften} von {Ellipsoiden} und euklidischen {R\"aumen.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {311--340},
     publisher = {mathdoc},
     volume = {78},
     year = {1974},
     zbl = {0291.52005},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1974__78_186331/}
}