@article{107037,
author = {Karel Svoboda},
title = {Contribution to the characterization of the sphere in $E^3$},
journal = {Archivum Mathematicum},
volume = {015},
year = {1979},
pages = {171-177},
zbl = {0435.53003},
mrnumber = {562341},
language = {en},
url = {http://dml.mathdoc.fr/item/107037}
}
Svoboda, Karel. Contribution to the characterization of the sphere in $E^3$. Archivum Mathematicum, Tome 015 (1979) pp. 171-177. http://gdmltest.u-ga.fr/item/107037/
Contributions to the giobal differential geometry of surfaces, Rozpravy ČSAV 1, 87 (1977), p. 1-94. (1977) | MR 0467608
On generalized Weingarten surfaces, Čas. pro pěst. matem. 3, 101 (1976), p. 263-270. (1976) | MR 0514124 | Zbl 0346.53028