%0 Journal Article
%A L. M. Lerman
%A Ya. L. Umanskii
%T Classification of four-dimensional integrable Hamiltonian systems and Poisson actions of 

%J Sbornik. Mathematics
%D 1994
%P 479-506
%V 78
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1994_78_2_a12/
%G en
%F SM_1994_78_2_a12