Siegmund-Schultze (2004) Siegmund-Schultze, Reinhard (2004), "Helmut Grunsky (1904–1986) in the Third Reich: A Mathematician Torn between Conformity and Dissent", in Roth, Oliver; Ruscheweyh, Stephan (eds.), Helmut Grunsky: Collected Papers, Lemgo: Heldermann, pp. XXXI–L, ISBN978-3-88538-501-1, MR2083061