Changes made by 90/63/EEC: Council Decision of 12 February 1990 amending, for the fourth time, Decision 88/303/EEC recognizing certain parts of the territory of the Community as being either officially swine-fever free or swine-fever free
EU Decision 1990/63
Made to 88/303/EEC: Council Decision of 24 May 1988 recognizing certain parts of the territory of the Community as being either officially swine fever free or swine fever free
From legislation.gov.uk's record of changes, the official one: see it there.