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This paper is concerned with the harmonic equation(P_(■ε)) : ?u = 0, u > 0 in B~n and ?u/?ν+((n-2)/2)u =((n-2)/2) Ku~(n/(n-2)■ε) on S~(n-1)where B~n is the unit ball in R~n, n ≥ 4 with Euclidean metric g_0, ?B~n= S~(n-1)is its boundary, K is a function