On the Boundary Ergodic Problem for Fully Nonlinear Equations in Bounded   Domains with General Nonlinear Neumann Boundary Conditions
  We study nonlinear Neumann type boundary value problems related to ergodic phenomenas. The particularity of these problems is that the ergodic constant appears in the (possibly nonlinear) Neumann boundary conditions. We provide, for bounded domains, several results on the existence, uniqueness and properties of this ergodic constant. 
Guy Barles (LMPT), Francesca Da Lio