Patecka-Frauenfelder, Anna. “Polish and German Press Reports on Cooperation Between the Foreign Ministers of Both Countries in Resolving the Conflict in Ukraine (February-June 2014)”. International Studies. Interdisciplinary Political and Cultural Journal, vol. 18, no. 2, Dec. 2016, pp. 133-51, doi:10.1515/ipcj-2016-0014.