Existence and uniqueness of invariant measures for SPDEs with two   reflecting walls
  In this article, we study stochastic partial differential equations with two reflecting walls, driven by space-time white noise with non-constant diffusion coefficients under periodic boundary conditions. The existence and uniqueness of invariant measures is established under appropriate conditions. The strong Feller property is also obtained. 
Juan Yang and Tusheng Zhang
math.PR math.AP