%0 Journal Article %A O. Ya. Viro %T Positioning in codimension 2, and the boundary %J Trudy Matematicheskogo Instituta imeni V.A. Steklova %D 1975 %V 30 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/RM_1975_30_1_a12/ %G ru %F RM_1975_30_1_a12