64However, it must be held that, with regard inter alia to frontier workers, the Court has allowed certain grounds of justification concerning legislation which distinguishes between residents and non-residents carrying out a professional activity in the State concerned, depending on the extent of their integration in the society of that Member State or their attachment to that State (see, to that effect, Hartmann, paragraphs 35 and 36; Geven, paragraph 26; and Hendrix, paragraphs 54 and 55).
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