Commission Regulation (EC) No 131/1999 of 21 January 1999 amending Regulation (EC) No 2249/98 imposing provisional anti-dumping and countervailing duties on imports of farmed Atlantic salmon originating in Norway with regard to certain exporters and amending Commission Decision 97/634/EC accepting undertakings offered in connection with the anti-dumping and anti-subsidies proceedings concerning imports of farmed Atlantic salmon originating in Norway