%0 Journal Article
%A Hejný, M.
%T The method of suplementing a picture by drawing
%J Učitel matematiky
%D 1993
%P 8-15
%V 1
%N 4
%U http://geodesic.mathdoc.fr/item/UM_1993_1_4_a5/
%G cs
%F UM_1993_1_4_a5