TY  - JOUR
AU  - I. P. Kostenko
TI  - Laws of Understandable Educational Text
JO  - Matematičeskoe obrazovanie
PY  - 2009
SP  - 27
EP  - 33
VL  - 49
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MO_2009_49_1_a3/
LA  - ru
ID  - MO_2009_49_1_a3
ER  -