Phase Structure of Systems with Multiplicative Noise
  The phase diagrams and transitions of nonequilibrium systems with multiplicative noise are studied theoretically. We show the existence of both strong and weak-coupling critical behavior, of two distinct active phases, and of a nonzero range of parameter values over which the susceptibility is infinite in any dimension. A scaling theory of the strong-coupling transition is constructed. 
G. Grinstein, M.A. Mu\~noz, and Yuhai Tu