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The asymptotic behaviour of certain entire functions of order zero. Lothar Berg — 1990 Aequationes mathematicae
The local structure of the solutions of the multidimensional translation equation. Lothar Berg — 1993 Aequationes mathematicae
Zum Problem der Operatorfunktionen mit verschwindender Ableitung Lothar Berg — 1969 Studia Mathematica