%0 Journal Article
%A A.N. Sarkovski
%T Characterization of the Cosine. (Short Communications).
%J Aequationes mathematicae
%D 1972
%P 312-312
%V 8
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AM2_1972__8_136307/
%F AM2_1972__8_136307