%0 Journal Article
%A S. V. Zharov
%T Geometric ideas of N.~Lobachevsky (for his 225-th anniversary)
%J Matematičeskoe obrazovanie
%D 2017
%P 48-51
%V 81
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MO_2017_81_1_a6/
%G ru
%F MO_2017_81_1_a6