Geodesic
Positioning in codimension 2, and the boundary
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 30 (1975) no. 1 
O. Ya. Viro. Positioning in codimension 2, and the boundary. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 30 (1975) no. 1. http://geodesic.mathdoc.fr/item/RM_1975_30_1_a12/
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     title = {Positioning in codimension 2, and the boundary},
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