%0 Journal Article
%A V. V. Petrov
%A A. V. Zaporozhets
%T A principle for evolving systems
%J Doklady Akademii Nauk
%D 1975
%P 779-782
%V 224
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/DAN_1975_224_4_a9/
%G ru
%F DAN_1975_224_4_a9