43In that regard, it is clear from the Court’s case-law that a sufficiently close connection between the employment relationship in question and the territory of the European Union derives, inter alia, from the fact that a European Union citizen, who is resident in a Member State, has been engaged by an undertaking established in another Member State on whose behalf he carries on his activities (see, to that effect, judgment in Petersen, C‑544/11, EU:C:2013:124, paragraph 42).
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