%0 Journal Article
%A V. I. Voytitsky
%T Gifts from Santa Claus or variations on the themes of the classics
%J Matematičeskoe obrazovanie
%D 2021
%P 28-37
%N 4
%U http://geodesic.mathdoc.fr/item/MO_2021_4_a5/
%G ru
%F MO_2021_4_a5