1. C.L. Siegel. “Zur Geschichte des Frankfurter Mathematischen Seminars.” Frankfurter Universitätsreden, 1964, Heft 36; also in Gesammelte Abhandlungen, V. 3, pp. 462–474. Authorized English translation in The Mathematical Intelligencer 1:4 (1979) 223–230.
2. A. Weil. André Weil: Oeuvres Scientifiques (Collected Papers). Springer-Verlag, New York, 1979.