%0 Journal Article
%A M.L., Polterovich, L.V. Bialy
%T Lagrangian singularities of invariant tori of hamiltonian systems with two degrees of freedom.
%J Inventiones mathematicae
%D 1989
%P 291-304
%V 97
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM_1989__97_2_143703/
%F IM_1989__97_2_143703