Geodesic
$S^n$ and $E^n$ are the only Riemannian spaces that admit an essential conformal transformation
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 28 (1973) no. 5 
D. V. Alekseevskii. $S^n$ and $E^n$ are the only Riemannian spaces that admit an essential conformal transformation. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 28 (1973) no. 5. http://geodesic.mathdoc.fr/item/RM_1973_28_5_a8/
@article{RM_1973_28_5_a8,
     author = {D. V. Alekseevskii},
     title = {$S^n$ and $E^n$ are the only {Riemannian} spaces that admit an essential conformal transformation},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1973},
     volume = {28},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1973_28_5_a8/}
}
TY  - JOUR
AU  - D. V. Alekseevskii
TI  - $S^n$ and $E^n$ are the only Riemannian spaces that admit an essential conformal transformation
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1973
VL  - 28
IS  - 5
UR  - http://geodesic.mathdoc.fr/item/RM_1973_28_5_a8/
LA  - ru
ID  - RM_1973_28_5_a8
ER  - 
%0 Journal Article
%A D. V. Alekseevskii
%T $S^n$ and $E^n$ are the only Riemannian spaces that admit an essential conformal transformation
%J Trudy Matematicheskogo Instituta imeni V.A. Steklova
%D 1973
%V 28
%N 5
%U http://geodesic.mathdoc.fr/item/RM_1973_28_5_a8/
%G ru
%F RM_1973_28_5_a8

Voir la notice de l'article provenant de la source Math-Net.Ru

[1] D. V. Alekseevskii, “Gruppy konformnykh preobrazovanii rimanovykh prostranstv”, Matem. sb., 89 (131):2 (10) (1972), 280–296 | MR

[2] N. H. Kuiper, “On conformally-flat spaces in the large”, Ann. Math., 50 (1949) | DOI | MR | Zbl