%0 Journal Article
%A D. O. Ptakhov
%T Primitive normality and additivity of free projective and strongly flat polygons
%J Algebra i logika
%D 2014
%P 614-624
%V 53
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/AL_2014_53_5_a3/
%G ru
%F AL_2014_53_5_a3