Changes made by Commission Regulation (EEC) No 45/82 of 8 January 1982 amending Regulation (EEC) No 2729/81 in respect of the period to be observed in cases of advance fixing of the refund under an invitation to tender in a non-member country in the milk and milk products sector: Commission Regulation (EEC) No 2729/81 of 14 September 1981 laying down special rules implementing the system of import and export licences and the advance fixing of refunds in respect of milk and milk products