%0 Journal Article
%A V. K. Ionin
%T On the definition of physical structures
%J Matematičeskie trudy
%D 1992
%P 42-51
%V 21
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MT_1992_21_a4/
%G ru
%F MT_1992_21_a4