TY  - JOUR
AU  - V. I. Voytitsky
AU  - A. Sh. Mustafaeva
TI  - Solution of extremal problems without use of derivative
JO  - Matematičeskoe obrazovanie
PY  - 2019
SP  - 7
EP  - 19
VL  - 90
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MO_2019_90_2_a1/
LA  - ru
ID  - MO_2019_90_2_a1
ER  -