%0 Journal Article
%A Ilie Corvei
%T The cosine functional equation for nilpotent groups.
%J Aequationes mathematicae
%D 1977
%P 99-106
%V 15
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AM2_1977__15_136633/
%F AM2_1977__15_136633