TY  - JOUR
AU  - Hejný, M.
TI  - The method of suplementing a picture by drawing
JO  - Učitel matematiky
PY  - 1993
SP  - 8
EP  - 15
VL  - 1
IS  - 4
UR  - http://geodesic.mathdoc.fr/item/UM_1993_1_4_a5/
LA  - cs
ID  - UM_1993_1_4_a5
ER  -