On the analytic structure of semi-groups of positive matrices.
Über die Umkehrung des Abelschen Stetigkeitssatzes mit funktionentheoretischen Methoden.
Explicit Representations of Dirichlet Approximations.
Transfer of connection problems for first level solutions of merimorphic differential equations, and associated Laplace transforms.
Characteristic approximation properties of quadratic irrationals.
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