1. On the trees of quantum fields;Brouder;Eur. Phys. J. C,2000
2. Renormalization of QED with planar binary trees;Brouder;Eur. Phys. J. C,2001
3. Ch. Brouder, A. Frabetti, Noncommutative Hopf algebra of formal diffeomorphisms, in preparation
4. Ch. Brouder, A. Frabetti, Groups of tree-expanded series, in preparation