%0 Journal Article
%A Kasahara, Shouro
%T A generalization of a theorem of Polak
%J Portugaliae mathematica
%D 1967
%P 385-387
%V 26
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/PORMA_1967__26_3_115042/
%G en
%F PORMA_1967__26_3_115042