^David X. Noack: Breaking up the Fortress on the Danube? German Policy towards Slovakia and Ruthenia, 1919–1933, in: Aliaksandr Piahanau/Bojan Aleksov (eds.): Wars and Betweenness: Big Powers in Middle Europe 1918–1945, Budapest/New York (NY): Central European University Press 2020, pp. 141–160.