“Christian Raitz Von Frentz, A Lesson Forgotten. Minority Protection under the League of Nations. The Case of the German Minority in Poland, 1920-1934”. Journal of East Central European Studies 52, no. 4 (December 22, 2003): 630. Accessed September 16, 2026. https://openjournals.osmikon.de/zfo/article/view/8171.