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With G. Lopez Garcia, "Existence and Multiplicity for a Resonance Problem for the p-Laplacian on Bounded Domains in R^N," Nonlinear Analysis: Theory, Methods & Applications 70:3 (1 February 2009), pp. 1193-1208

With V.L. Shapiro, "Jumping Nonlinearities and Weighted Sobolev Spaces," Journal of Differential Equations, 214, 326-357, 2005

With G. Lopez G., "Multiple Solutions of Semilinear Elliptic Problems in R^N at Resonance," Journal of Mathematical Analysis and Applications, 305, 367-379, 2005

With G. Lopez G., "Resonance and strong resonance for semilinear elliptic equations in R^N," Electronic Journal of Differential Equations, 2003, No. 124, 1-22, 2003

With S. Robinson and V.L. Shapiro, "One-sided Resonance Problems for Quasilinear Elliptic Operators," Journal of Mathematical Analysis and Applications, 256, 636-649, 2001

With V.L. Shapiro, "One-sided Resonance for a Quasilinear Variational Problem," Contemporary Mathematics, 208, 277-299, 1997

With E. Landesman, S. Robinson and A. J. Rumbos, "Multiple Solutions of Semilinear Elliptic Problems at Resonance," Nonlinear Analysis: Theory, Methods & Applications, 24, 1049-1059, 1995