Addendum to the paper "Combinatorics of the modular group II: the   Kontsevich integrals"
  Addendum to the paper Combinatorics of the Modular Group II The Kontsevich integrals, hep-th/9201001, by C. Itzykson and J.-B. Zuber (3 pages) 
C. Itzykson and J.-B. Zuber