Principles of international law concerning friendly relations and cooperation / edited by Milan Sahovic. Sahovic, Milan, ed. International law. 341 PRI Rev. translation of Kodifikacija principa miroljubive i aktivne koegzistencije. Belgrade : Institute of International Politics and Economics; Dobbs Ferry, N.Y., Oceana Publications, 1972. 1972. 1972 Text 450 p. ; eng