1. Bojar, E. (1994a), Joint Ventures; New Form of Cooperation in Western and Eastern Countries and Big Chance for the Development of Weak Economic Regions. European Congress of the Regional Science Association, Groningen.
2. Gli investimenti esteri in Polonia. Aspetti economici e normativi per la costituzione di joint venture;Bojar;Economia e Management,1995
3. Bojar, E. (1995b), The Polish Experiences in the Field of Euroregions in the New Regional Context. European Congress of the Regional Science Association, Odense.
4. Bojar, E. (1995c), Joint ventures w procesie integracji regionalnej. In: M.Baltowski, ed., Euroregion Bug. Problemy wspolpracy przygranicznej Polski, Bialorusi, Ukrainy, pp. 97-113. Lublin.