sentences:  He graduated from the Faculty of Business and Economics at the University of Zagreb, and made postgraduate studies in philosophy, politics, economics, law and sociology in Zagreb, Belgrade and Ljubljana.He made study visits to the U.S., the former U.S.S.R., China and Europe on the sociology of international relations, especially irenology (peace studies) and polemology (war studies) in the context of international relations.He was made senior research fellow at the Institute of Economics in Zagreb, Croatia in 1970, and later became head respectively of the Institute's Department for International Relations, Department for Strategic Research, and Department of Supradisciplinary Research for existence and development of life on the planet Earth.