“…System (1.1) was already studied in the whole space e.g. in the papers [4,5,6,13,14,16,17,19], where several results either on a blow up or on a large time behavior of solutions have been obtained. For each constant A ∈ R, the couple (u, ψ) = (A, A) is a stationary solution of system (1.1) and, since the domain is unbounded, it does not belong to any Lebesgue L pspace with p ∈ [1, ∞).…”