%0 Journal Article
%A Stefanov, Simeon
%A Dragieva, Velika
%T Evolution of Sets Systems and Homotopy Groups of Spheres
%J Mathematics and Education in Mathematics
%D 2012
%P 202-206
%V 41
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MEM_2012_41_1_a20/
%G en
%F MEM_2012_41_1_a20