%0 Journal Article
%A A. A. Mal'tsev
%T On the structure of families of immune, hyperimmune and hyperhyperimmune sets
%J Sbornik. Mathematics
%D 1985
%P 301-313
%V 52
%N 2
%U http://geodesic.mathdoc.fr/item/SM_1985_52_2_a1/
%G en
%F SM_1985_52_2_a1