33Although in general the principle of legal certainty precludes a Community measure from taking effect from a point in time before its publication, it may exceptionally be otherwise where the purpose to be achieved so demands and where the legitimate expectations of those concerned are duly respected (see, to that effect, Case C-368/89 Crispoltoni [1991] ECR I-3695, paragraph 17; Gemeente Leusden and Holin Groep, cited above, paragraph 59; see also the judgment of the European Court of Human Rights in National & Provincial Building Society v. United Kingdom of 23 October 1997, Reports of Judgments and Decisions 1997-VII, § 80).
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