Changes made by 90/141/EEC: Council Decision of 12 March 1990 on the attainment of progressive convergence of economic policies and performance during stage one of economic and monetary union
EU Decision 1990/141
The legislation 90/141/EEC: Council Decision of 12 March 1990 on the attainment of progressive convergence of economic policies and performance during stage one of economic and monetary union changes, newest first. Choose one to see each change.
From legislation.gov.uk's record of changes, the official one: see it there.