1. Summation of formal power series through iterated Laplace integrals;['Balser, Werner'];Math. Scand.,1992
2. [2] Balser, Werner Formal power series and linear systems of meromorphic ordinary differential equations, Universitext, Springer, New-York, 2000, xviii+299 pages
3. Multisummability of formal power series solutions of linear ordinary differential equations;['Balser, Werner', 'Braaksma, Boele L. J.', 'Ramis, Jean-Pierre', 'Sibuya, Yasutaka'];Asymptot. Anal.,1991
4. Birkhoff invariants and Stokes multipliers for meromorphic linear differential equations;['Balser, Werner', 'Jurkat, Wolfgang B.', 'Lutz, Donald A.'];J. Math. Anal. Appl.,1979
5. A general theory of invariants for meromorphic differential equations; Part I, formal invariants;['Balser, Werner', 'Jurkat, Wolfgang B.', 'Lutz, Donald A.'];Funkcial. Ekvac.,1979