50Where the national court entertains doubts as to whether the measures at issue should be categorized as State aid, it may seek clarification from the Commission on that point. In its notice on cooperation between national courts and the Commission in the State aid field (OJ 1995 C 312, p. 8), the Commission expressly encouraged national courts to make contact with it when they encounter difficulties in the application of Article 93(3) of the Treaty and explained what kind of information it was able to supply. It should be noted, in that regard, that as a consequence of the duty of sincere cooperation between the Community institutions and the Member States resulting from Article 5 of the Treaty (Case C-2/88 Imm. Zwartveldand Others [1990] I-3365, paragraphs 17 and 18), the Commission must respond as quickly as possible to requests from national courts.
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