Poincar\'e lemma and global homotopy formulas with sharp anisotropic   H\"older estimates in q-concave CR manifolds
  We prove sharp anisotropic H\"older estimates for the local solutions of the tangential Cauchy-Riemann equation in q-concave CR manifolds and we derive the same kind of estimates for global solutions when the manifold is compact. 
Christine Laurent-Thi\'ebaut (IF)