%0 Journal Article
%A E. I. Znak
%T Operators of the type $Af(x)=f(aх+b)-\lambda f(x)$ and functional equations in problems of math competitions
%J Matematičeskoe obrazovanie
%D 2017
%P 33-39
%V 81
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MO_2017_81_1_a4/
%G ru
%F MO_2017_81_1_a4