Geodesic
Splitting Obstruction Groups in Codimension~2
Matematičeskie zametki, Tome 69 (2001) no. 1, pp. 52-73.

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The splitting obstruction groups depend functorially on the square of fundamental groups. In the paper the problem of splitting along a submanifold of codimension two under some restrictions on the square of fundamental groups is considered. New exact sequences and commutative diagrams containing Wall groups, splitting obstruction groups, and surgery obstruction groups for manifold pairs are obtained. Examples of computation of splitting obstruction groups and natural maps are considered. 
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I. Maleshich; Yu. V. Muranov; D. Repovš. Splitting Obstruction Groups in Codimension~2. Matematičeskie zametki, Tome 69 (2001) no. 1, pp. 52-73. http://geodesic.mathdoc.fr/item/MZM_2001_69_1_a4/

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