Seminar on Natural Gas Rate-Making in the ECE Region and Its Implications for Gas Price Transition in Economies in Transition (1997 : Amsterdam, Netherlands)
organized by the Committee on Housing, Building and Planning of the United Nations Economic Commission for Europe and held in Warsaw, Poland, 23-27 September 1968
organized by the United Nations Economic Commission for Europe and the Food and Agriculture Organization of the United Nations, Budapest, 25-28 April, 1977