%0 Journal Article %A O. Ya. Viro %T Branched coverings of manifolds with boundary and link invariants.~I %J Izvestiya. Mathematics %D 1973 %P 1239-1256 %V 7 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_1973_7_6_a2/ %G en %F IM2_1973_7_6_a2