Political, legal history and ideology of the East-Central European communist regimes, structure and working of the party state in a comparatistical perspective. Border studies (role and importance of borders and border crossing). History of Czechoslovakia.
Ernő Gerő and the Policy of the “Clear Sheet” in 1956
History of the Hungarian State from 1949 to 1989
Political Life of Hódmezővásárhely from 1944 to 1950
The Age of State Socialism (a database)
History of Hungarian Travel Documents from 1867 to 1990
Atlas of “Europe-Between” (with Lajos Pándi, Nándor Bárdi etc.)