Article 4
1. Interested parties shall participate in special invitations to tender either by lodging their written tenders with the intervention agency against an acknowledgment of receipt or by forwarding a registered letter to the intervention agency or by any other means of written telecommunication. 2. Tenders shall state: (a) the name and address of the tenderer; (b) the quantity applied for; (c) the price tendered per tonne of butter, not including domestic taxes, ex-cold storage depot, expressed in ecus; (d) the cold storage depots where the butter is held. 3. Tenders shall be valid only if: (a) they cover a minimum of 500 tonnes; (b) they are accompanied by a written undertaking by the tenderer waiwing any rights to legal action in respect of the quality and characteristics of the butter sold and a written undertaking to export the butter awarded, in an unaltered state, within the time limit laid down in Article 8 (3) to the destinations indicated in Article 1; (c) proof is furnished that the tenderer has lodged, before the expiry of the deadline for the submission of tenders, the tendering security referred to in Article 5 for the special invitation to tender concerned. 4. Tenders may not be withdrawn after the expiry of the deadline referred to in Article 2 (4) for the submission of tenders relating to the special invitation to tender concerned.