28As to the choice of those aspects, Article 47 of Directive 2004/18 leaves a fair degree of freedom to the contracting authorities. Unlike Article 48 of the Directive which, as regards technical and professional capacity, establishes a closed system which limits the methods of assessment and verification available to those authorities and, therefore, limits their opportunities to lay down requirements (see, as regards the similar provisions in earlier directives than Directive 2004/18, Case 76/81 Transporoute et travaux [1982] ECR 417, paragraphs 8 to 10 and 15), Article 47(4) expressly authorises contracting authorities to choose the probative references which must be produced by candidates or tenderers to furnish proof of their economic and financial standing. As Article 44(2) of Directive 2004/18 refers to Article 47, the same freedom of choice exists as regards the minimum levels of economic and financial standing.
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