The Birkhoff decomposition in groups of formal diffeomorphisms

Frédéric Menous

Comptes Rendus. Mathématique, Volume 342 (2006) p. 737-740

Formulas for the Connes–Moscovici Hopf algebra

Frédéric Menous

Comptes Rendus. Mathématique, Volume 341 (2005) p. 75-78