TY  - JOUR
AU  - T. N. Bryantseva
AU  - V. A. Delyanov
TI  - Differentiation of functions at the secondary school
JO  - Matematičeskoe obrazovanie
PY  - 2017
SP  - 7
EP  - 12
VL  - 83
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MO_2017_83_3_a1/
LA  - ru
ID  - MO_2017_83_3_a1
ER  -