%0 Journal Article
%A A. T. Fomenko
%T A topological invariant which roughly classifies integrable strictly nondegenerate Hamiltonians on four-dimensional symplectic manifolds
%J Funkcionalʹnyj analiz i ego priloženiâ
%D 1991
%P 23-35
%V 25
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/FAA_1991_25_4_a2/
%G ru
%F FAA_1991_25_4_a2