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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.doi:10.1103/physrevlett.76.4376 pmid:10061274 fatcat:fr7cwieuxfacpdxs75kn2mdrrq