%0 Journal Article
%A M. M. Postnikov
%T Investigations in homotopy theory of continuous mappings. I.~The algebraic theory of systems. II.~The natural system and homotopy type
%J Informatics and Automation
%D 1955
%P 3-158
%V 46
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TRSPY_1955_46_a0/
%G ru
%F TRSPY_1955_46_a0