%0 Journal Article
%A A. B. Katok
%T Entropy and approximations of dynamical systems by periodic transformations
%J Funkcionalʹnyj analiz i ego priloženiâ
%D 1967
%P 75-85
%V 1
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/FAA_1967_1_1_a6/
%G ru
%F FAA_1967_1_1_a6