%0 Journal Article
%A J.A. Goldstein
%A S. Ôharu
%T A remark on nonlinear cosine functions.
%J Semigroup forum
%D 1986
%P 359-366
%V 34
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1986__34_134849/
%F SF_1986__34_134849