establishment and development of constitutional monarchy in Hungary between 1848 and 1944; form of government in the light of the position of the Head of State; government, political and legal responsiblity of the government

development of parliamebntary suffrage in Europe in the 19-20th centuries; question of "legal basis" and census in electoral laws; struggle for the universal suffrage: franchise as a fundamental political right; the characteristic electoral systems in Europe: majority and proportional models

theory of absolutism; absolute monarchy as a form of government; historical development and state models of the absolute monarchy

formation and development of the three Northern European Christian monarchies in the Middle Ages; the early modern Estate governments and the emergence of the absolute monarchy in Denmark-Norway and in Sweden; modern constitutions in Scandinavia and the development of parliamentary government in the Nordic countries

formation of the United States of America, the American model of federalism (federal republic) and presidential system of government; effects of the US constitution to the Hungarian political and constitutional thinking in the 18-19th centuries

History of the Hungarian commercial law from the 18th century until the Civil Code of 2013, with special regard to the codification efforts of the 18-19th centuries; the transplant of the institution of the [German] limited liability company [GmbH]; and the situation of classic commercial companies in the Socialist Era.

Establishment and development of the Hungarian and Polish-Lithuanian estate assemblies, characteristics of their structures and composition, decision making processes, the model of legislative power in Hungary and Poland-Lithuania in the early modern period