%0 Journal Article
%A V. I. Voytitsky
%A A. Sh. Mustafaeva
%T Solution of extremal problems without use of derivative
%J Matematičeskoe obrazovanie
%D 2019
%P 7-19
%V 90
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MO_2019_90_2_a1/
%G ru
%F MO_2019_90_2_a1