%0 Journal Article
%A Svoboda, Karel
%T Several new characterizations of the 2-dimensional sphere in $E^4$
%J Czechoslovak Mathematical Journal
%D 1979
%P 573-583
%V 29
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1979.101639/
%R 10.21136/CMJ.1979.101639
%G en
%F 10_21136_CMJ_1979_101639