Free energy topological expansion for the 2-matrix model
  We compute the complete topological expansion of the formal hermitian two-matrix model. For this, we refine the previously formulated diagrammatic rules for computing the 1/ N expansion of the nonmixed correlation functions and give a new formulation of the spectral curve. We extend these rules obtaining a closed formula for correlation functions in all orders of topological expansion. We then integrate it to obtain the free energy in terms of residues on the associated Riemann surface. 
Leonid Chekhov (LIFR-Mi2p, Itep, Steklov Institute), Bertrand Eynard   (SPhT), Nicolas Orantin (SPhT)