A Characterization of the Sphere and Euclidean Space by Transformation Groups.
A family of flat Minkowski planes admitting 3-dimensional simple groups of automorphisms.
A note on Lie algebroids which arise from groupoid actions
A note on my paper "Notes on compact semigroups with identity".
A note on the location of joint discontinuity.
Actions of some infinite Lie groups.
Adhérence d'orbite et invariants.
An algebraic group associated to an ergodic diffeomorphism