%0 Journal Article
%A Cater, F. S.
%T An Elementary Proof of a Theorem on Unilateral Derivatives
%J Canadian mathematical bulletin
%D 1986
%P 341-343
%V 29
%N 3
%U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1986-052-5/
%R 10.4153/CMB-1986-052-5
%F 10_4153_CMB_1986_052_5