%0 Journal Article
%A Pl. Kannappan
%T On cosine and sine functional equations
%J Annales Polonici Mathematici
%D 1968
%P 245-249
%V 20
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.4064/ap-20-3-245-249/
%R 10.4064/ap-20-3-245-249
%G en
%F 10_4064_ap_20_3_245_249