%0 Journal Article
%A A. N. Afanasyev
%T Directed angles and isogonality
%J Matematičeskoe obrazovanie
%D 2024
%P 2-11
%N 1
%U http://geodesic.mathdoc.fr/item/MO_2024_1_a0/
%G ru
%F MO_2024_1_a0