%0 Journal Article
%A S. V. Bolotin
%A V. V. Kozlov
%T Topology, singularities and integrability in Hamiltonian systems with two degrees of freedom
%J Izvestiya. Mathematics 
%D 2017
%P 671-687
%V 81
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM2_2017_81_4_a0/
%G en
%F IM2_2017_81_4_a0