Commission Regulation (EC) No 2809/2000 of 20 December 2000 laying down detailed rules for the application, for cereals sector products, of Regulations (EC) No 2290/2000, (EC) No 2433/2000, (EC) No 2434/2000 and (EC) No 2435/2000 establishing certain concessions in the form of Community tariff quotas for certain agricultural products originating in the Republic of Bulgaria, the Czech Republic, the Slovak Republic and Romania respectively and amending Regulation (EC) No 1218/96