Charakterisierung der additiven, fast-geraden Funktionen. A. Hildebrand; J. Spilker — 1980 Manuscripta mathematica
On some tauberian theorems related to the prime number theorem A. Hildebrand; G. Tenenbaum — 1994 Compositio Mathematica
Still another proof of Parseval's equation for almost-even arithmetical functions. A. Hildebrand; W. Schwarz; J. Spilker — 1988 Aequationes mathematicae