Development and international co-operation : implementation of the decisions adopted by the General Assembly at its 7th special session : proposed programme budget for the biennium 1976-1977 and medium-term plan for the period 1976-1979 : administrative and financial implications of the report of the Ad Hoc Committee on the Restructuring of the Economic and Social Sectors of the United Nations system : 25th report of the Advisory Committee on Administrative and Budgetary Questions to the General Assembly at its 30th session