Degeneration of Riemann surfaces and intermediate polarization of the moduli space of flat connections.
Determination of the topological structure of an orbifold by its group of orbifold diffeomorphisms.
Differentiable Group Actions on Homotopy Spheres. I. Differential Structure and the Knot Invariant.
Distortion in transformation groups (with an appendix by Yves de Cornulier).
Division property of the momentum map.