%0 Journal Article
%A Ya. B. Pesin
%T Geodesic flows on closed Riemannian manifolds without focal points
%J Izvestiya. Mathematics 
%D 1977
%P 1195-1228
%V 11
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM2_1977_11_6_a3/
%G en
%F IM2_1977_11_6_a3