24As far as this notion is concerned, suffice it to say, as is clear from all the observations submitted, that what is required under Decision No 128 is the maintenance of a direct link between the undertaking established in a Member State and the workers which it has posted to another Member State during the period of posting of those workers. In order to establish the existence of such a direct link, it is necessary to deduce from all the circumstances of the worker's employment that he is under the authority of that undertaking (see, in this regard, the judgments in van der Vecht, at p. 354 and Manpower, at paragraphs 18 and 19).
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