Changes made by 83/138/EEC: Commission Decision of 25 March 1983 concerning certain measures to prevent the spread of African swine fever
EU Decision 1983/138
No changes made by 83/138/EEC: Commission Decision of 25 March 1983 concerning certain measures to prevent the spread of African swine fever are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.