“…where χ : R 1+2 → R is an arbitrary C ∞ function. Recently, the existence of stationary states for system (1.1) has been extensively investigated, see for example [8,9,10,11,12,17,15,22,23,28,29,32]. In these references, the authors seek the solutions to (1.1) of the following form If we insert the ansatz (1.2) into the system (1.1), then (1.1) is reduced to the following nonlocal elliptic equation:…”