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The elliptic differential equations of second order n∑i,j=1 Di[Aij(x,y)Djy] +P(x,y) +Q(x,y, (△)y) == e(x), x ∈Ω.will be considered in an exterior domain Ω (∩) Rn, n ≥ 2. Some oscillation criteria are given by integral averaging technique.