TY  - JOUR
AU  - Švec, Alois
TI  - Several new characterizations of the sphere
JO  - Czechoslovak Mathematical Journal
PY  - 1975
SP  - 645
EP  - 652
VL  - 25
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1975.101360/
DO  - 10.21136/CMJ.1975.101360
LA  - en
ID  - 10_21136_CMJ_1975_101360
ER  -