Existence and nonexistence of positive solutions of indefinite elliptic problems in R^N$, Advanced Nonlinear Studies 3 (2003).
(Mit V. Felli) Perturbation Results of Critical Elliptic Equations of Caffarelli-Kohn-Nirenberg Type, Journal of Differential Equations 191 (2003).
(Mit V. Felli) A note on regularity of solutions to degenerate elliptic equations of Caffarelli-Kohn-Nirenberg type, Advanced Nonlinear Studies 3 (2003).
(Mit T. Bartsch und T. Weth) Multiple solutions of a critical polyharmonic equation, Journal für die Reine und Angewandte Mathematik 571 (2004).
(Mit V. Felli) Compactness and existence results for degenerate elliptic equations, Communications in Contemporary Mathematics 7 (2005).
Apriori estimates for the scalar curvature equation on S^3, Calculus of Variations and Partial Differential Equations 29, (2007).
Prescribing scalar curvature on S^3, Annales de l'Institut Henri Poincaré: Analyse non-linéaire 24 (2007).
The scalar curvature equation on S^3, Journal of Functional Analysis 257 (2009).
Closed magnetic geodesics on S^2, Journal of Differential Geometry 87 (2011).
Alexandrov embedded closed magnetic geodesics on S^2, Ergodic Theory Dynam. Systems (2011), doi:10.1017/S0143385711000289
(Mit H. Rosenberg) Embedded constant curvature curves on convex surfaces, Pacific Journal of Mathematics 253 (2011)
Multiple solutions to the planar Plateau problem , arXiv:0903.1132, accepted Differential and Integral Equations (2011)
Closed magnetic geodesics on closed hyperbolic Riemann surfaces, arXiv:1009.1723, accepted Proceedings of the London Mathematical Society (2012)