40It follows from the above that a harmonised standard such as that at issue in the main proceedings, adopted on the basis of Directive 89/106 and the references to which have been published in the Official Journal of the European Union, forms part of EU law, since it is by reference to the provisions of such a standard that it is established whether or not the presumption laid down in Article 4(2) of Directive 89/106 applies to a given product.
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