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We show that if $N(p+q-1)<p+1$ then, for every positive, finite Borel measure $\\mu$ on $\\partial \\Omega$, there exists a solution of (E) such that $u=\\mu$ on $\\partial \\Omega$. Furthermore, if $N(p+q-1)\\geq p+1$ then an isolated point singularity on $\\partial \\Omega$ is removable. In particular there is no solution with boundary data $\\delta_y$ (=Dirac measure at a point $y\\in \\partial \\Omega$). 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