The following articles are available for downloading:

• Transformation of reducible equations to Birkhoff standard form (jointly with A. A. Bolibruch) Ulmer Seminare über Funktionalanalysis und Differentialgleichungen, no. 2, 1997, pp. 73-81.
• Summability of formal power series solutions of a perturbed heat equation (jointly with M. Loday-Richaud) Ulmer Seminare über Funktionalanalysis und Differentialgleichungen, no. 11, 2007, pp. 45-52.
• Summability of formal solutions for abstract Cauchy problems and related convolution equations (jointly with A. Duval and S. Malek) Ulmer Seminare über Funktionalanalysis und Differentialgleichungen, no. 11, 2007, pp. 29-44.
• Systems of linear ordinary differential equations - a review of three solution methods (jointly with C. Röscheisen and F. Steiner) Ulmer Seminare über Funktionalanalysis und Differentialgleichungen, no. 11, 2007, pp. 53-62.
• Summability of solutions of the heat equation with inhomogeneous thermal conductivity in two variables (jointly with M. Loday-Richaud)
• Gevrey order of formal power series solutions of inhomogeneous partial differential equations with constant coefficients (jointly with M. Yoshino)
• Integrablility of Hamiltonian Systems and Borel summability (jointly with M. Yoshino)
• Computation of formal solutions of systems of linear difference equations (jointly with Th. Bothner)
• Computation of the Stokes multipliers of Okubo's confluent hypergeometric system

Note that after a preprint has been accepted by any mathematical journal requiring transfer of copyright, it shall be removed from this list.