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We study kernel estimates for parabolic problems governed by singular elliptic operators equation* ₈, ₉=₁^N+1q₈₉D₈₉+cDᵧy, c+1>0, equation* in the half-space R^N+1_+=\ (x, y): x RN, y>0\ under Neumann boundary conditions at y=0.
Negro et al. (Mon,) studied this question.