1. “CERN Kicks Bertolt Brecht to Life,” Critical Stages, accessed April 17, 2022, https://www.critical-stages.org/11/cern-kicks-bertolt-brecht-to-life/.
2. Kirsten Shepherd-Barr, Science on Stage: From Doctor Faustus to Copenhagen (Princeton: Princeton University Press, 2006).
3. Michael Frayn, Copenhagen (London: Methuen Drama, 2003), 7. Aage Petersen was Bohr’s assistant from 1952 to 1962 but much too young to have been on the scene in 1941.
4. For details on Brecht’s life and work, see Stephen Parker, Bertolt Brecht: A Literary Life (London: Bloomsbury, 2014). Another and even more detailed biography is Werner Mittenzwei, Das Leben des Bertolt Brecht, oder der Umgang mit den Welträtseln, 2 vols. (Berlin: Aufbau-Verlag, 1988).
5. Harald Engberg, Brecht på Fyn, 2 vols. (Odense: Andelstrykkeriet, 1966), 1:88. Translated into German as Brecht auf Fünen: Exil in Dänemark 1933–1939 (Wuppertal: Peter Hammer, 1974).