35It is true that there may be works with special requirements necessitating a certain capacity which cannot be obtained by combining the capacities of more than one operator, which, individually, would be inadequate. In such circumstances, the contracting authority would be justified in requiring that the minimum capacity level concerned be achieved by a single economic operator or, where appropriate, by relying on a limited number of economic operators, in accordance with the second subparagraph of Article 44(2) of Directive 2004/18, as long as that requirement is related and proportionate to the subject-matter of the contract at issue.
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