@article{GDZPPN002416808,
title = {A Characterization of the Sphere and Euclidean Space by Transformation Groups.},
journal = {Mathematische Zeitschrift},
volume = {147},
year = {1976},
pages = {137-142},
zbl = {0315.57029},
url = {http://dml.mathdoc.fr/item/GDZPPN002416808}
}
Abels, Herbert; Lauer, Annette. A Characterization of the Sphere and Euclidean Space by Transformation Groups.. Mathematische Zeitschrift, Tome 147 (1976) pp. 137-142. http://gdmltest.u-ga.fr/item/GDZPPN002416808/