%0 Journal Article
%A Cegielski, Andrzej
%T A generalization of the Opial's theorem
%J Control and Cybernetics
%D 2007
%P 601-610
%V 36
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CC_2007_36_3_a8/
%G en
%F CC_2007_36_3_a8