Council Regulation (EEC) No. 1391/91 imposing a definitive anti-dumping duty on imports of aspartame originating in Japan and the United States of America 27 May 1991 - World Trade and Arbitration Materials View Council Regulation (EEC) No. 1391/91 imposing a definitive anti-dumping duty on imports of aspartame originating in Japan and the United States of America 27 May 1991 by - World Trade and Arbitration Materials Council Regulation (EEC) No. 1391/91 imposing a definitive anti-dumping duty on imports of aspartame originating in Japan and the United States of America 27 May 1991 3 4 World Trade and Arbitration Materials