%0 Journal Article
%A I. P. Kostenko
%T Laws of Understandable Educational Text
%J Matematičeskoe obrazovanie
%D 2009
%P 27-33
%V 49
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MO_2009_49_1_a3/
%G ru
%F MO_2009_49_1_a3