%0 Journal Article
%A G. Malaty
%T Mathematical Problems and Mathematical Structures
%J Matematičeskoe obrazovanie
%D 2004
%P 107-116
%V 28
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MO_2004_28_1_a5/
%G ru
%F MO_2004_28_1_a5