Changes made by 91/93/EEC: Commission Decision of 11 February 1991 determining the period of the year during which Portugal may dispatch certain equidae from the part of its territory considered to be infected with African horse sickness
EU Decision 1991/93
No changes made by 91/93/EEC: Commission Decision of 11 February 1991 determining the period of the year during which Portugal may dispatch certain equidae from the part of its territory considered to be infected with African horse sickness are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.