%0 Journal Article
%A H. Schwerdtfeger
%T Involutory Functions and Even Functions. (Short Communication).
%J Aequationes mathematicae
%D 1968
%P 210-210
%V 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AM2_1968__1_135969/
%F AM2_1968__1_135969