Due to the relations and cooperation between the Fraknói Research Group and the Institute of Church History of the University of Vienna, Krisztina Tóth and Benedikt Rupp worked together on the Bischofslexikon der Habsburgermonarchie 1804–1918. Benedikt Rupp spent two days in Budapest, and with the help of Krisztina Tóth did the finishing works on the project.