Changes made by 85/373/Euratom: Council Decision of 25 July 1985 complementing Decision 84/1/Euratom, EEC with a view to the realization of a tritium-handling laboratory
EU Decision 1985/373
Made to 84/1/Euratom, EEC: Council Decision of 22 December 1983 adopting a research programme to be implemented by the Joint Research Centre for the European Atomic Energy Community and for the European Economic Community (1984 to 1987)
From legislation.gov.uk's record of changes, the official one: see it there.