On the theory of Sobolev-type classes of functions with values in a metric space.
On the uniform perfectness of groups of bundle homeomorphisms
Groups of homeomorphisms related to locally trivial bundles are studied. It is shown that these groups are perfect. Moreover if the homeomorphism isotopy group of the base is bounded then the bundle homeomorphism group of the total space is uniformly perfect.
On the uniqueness of the analyticity of a proper G-action.
One-parameter submonoids in locally complete differentiable monoids
Opérateurs elliptiques et mesures sur l'espace des lacets invariants par le groupe des difféomorphismes du cercle
Orbifold Riemann surfaces and the Yang-Mills-Higgs equations
Outer automorphism groups of Bieberbach groups.