%0 Journal Article %A E. V. Ferapontov %T Integration of weekly nonlinear semi-hamiltonian systems of hydrodynamic type by methods of the theory of~webs %J Sbornik. Mathematics %D 1992 %P 65-79 %V 71 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1992_71_1_a5/ %G en %F SM_1992_71_1_a5