61Nevertheless, it must be held that those considerations may be transposed to the Treaty provisions and to the principles which relate to public service concessions excluded from the scope of the directives on public procurement. Indeed, in the field of public procurement and public service concessions, the principle of equal treatment and the specific expressions of that principle, namely the prohibition on discrimination on grounds of nationality and Articles 43 EC and 49 EC, are to be applied in cases where a public authority entrusts the supply of economic activities to a third party. By contrast, it is not appropriate to apply the Community rules on public procurement or public service concessions in cases where a public authority performs tasks in the public interest for which it is responsible by its own administrative, technical and other means, without calling upon external entities (see, to that effect, Stadt Halle and RPL Lochau, paragraph 48).
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