On the signatur of four-manifolds with universal covering spin.
A non-extended hermitian form over Z [Z].
4-Manifold topology I: Subexponential groups.
4-Manifold topology II: Dwyer's filtration and surgery kernels.
All two dimensions links are null homotopic.
Higher order intersection numbers of 2-spheres in 4-manifolds.
New topologically slice knots.
Alexander duality, gropes and link homotopy.
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