PhD Dissertation at the Faculty of Humanities and Social Sciences of the University of Zagreb 2001.
Presented by mr. sc. Zeljko Uvanovic. Supervisor: Prof. Dr. Vlado Obad (University of Osijek). Commission: Prof. Dr. Marijan Bobinac (Zagreb), Prof. Dr. Vlado Obad and Prof. Dr. Dragutin Horvat (Zagreb)