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Pallara, V. Vespri: $L^p$-estimates for a class of elliptic operators with unbounded coefficients in ${\mathbb R}^n$ Houston J. Math. Vol. 31, p. 605-620, 2005 M. Miranda Jr, E. Pascali: On a class of differential equations with self-reference Rend. Mat. Appl. Vol. (7) 25, N. 2, p. 155-164, 2005 R. Monti: Sobolev inequalities for weighted gradients Comm. Part. Diff. Eq. (Accepted Paper) 2005 R. Monti, D. Morbidelli: Kelvin transform for Grushin operators and critical semilinear equations Duke Math. J. (Accepted Paper) 2005 G. Moscariello, C. Sbordone: Optimal Lp-properties of Green's functions for non-divergence elliptic equations in two dimensions Studia Mathematica Vol. 168, N. 2, p. 133-141, 2005 D. Mugnai: Asymptotic behaviour, nodal lines and symmetry properties for solutions of superlinear elliptic equations near an eigenvalue ESAIM:COCV Vol. 11, N. 4, p. 508-521, 2005 M. Negri: A discontinuous finite element approach for the approximation of free discontinuity problems Adv. 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