%0 Journal Article %A A. M. Vinogradov %A V. A. Yumaguzhin %T Differential invariants of webs on 2-dimensional manifolds %J Matematičeskie zametki %D 1990 %P 26-37 %V 48 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_1990_48_1_a4/ %G ru %F MZM_1990_48_1_a4