%0 Journal Article
%A A. T. Fomenko
%T A~bordism theory for integrable nondegenerate Hamiltonian systems with two degrees of freedom. A~new topological invariant of higher-dimensional integrable systems
%J Izvestiya. Mathematics 
%D 1992
%P 731-759
%V 39
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM2_1992_39_1_a2/
%G en
%F IM2_1992_39_1_a2