The Mongol Invasion in the Year 1241 - Reactions among European Rulers and Consequences for East Central European Principalities - Vercamer, Grischa (. Zeitschrift für Ostmitteleuropa-Forschung. - Marburg, L. : Verl. Herder-Inst., 1952-. - Online-Ressource. - ISSN 2701-0449 70, 2021)