%0 Journal Article
%A L. D. Pustyl'nikov
%T Existence of invariant curves for maps close to degenerate maps, and a~solution of the~Fermi--Ulam problem
%J Sbornik. Mathematics
%D 1995
%P 231-241
%V 82
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1995_82_1_a11/
%G en
%F SM_1995_82_1_a11