%0 Journal Article %A M. L. Byalyi %A L. V. Polterovich %T Lagrangian projections of invariant tori of Hamiltonian systems with two degrees of freedom %J Funkcionalʹnyj analiz i ego priloženiâ %D 1989 %P 65 %V 23 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/FAA_1989_23_1_a8/ %G ru %F FAA_1989_23_1_a8