Changes to 83/641/EEC: Council Decision of 12 December 1983 adopting joint research programmes and programmes for coordinating agricultural research
EU Decision 1983/641
Made by 87/218/EEC: Council Decision of 19 March 1987 amending Decision 83/641/EEC adopting joint research programmes and programmes for coordinating agricultural research
From legislation.gov.uk's record of changes, the official one: see it there.