18Measures of the Community institutions are in principle presumed to be lawful and accordingly produce legal effects until such time as they are withdrawn, annulled in an action for annulment or declared invalid following a reference for a preliminary ruling or a plea of illegality (see, to that effect, Case C-137/92 P Commission v BASF and Others [1994] ECR I-2555, paragraph 48, and Case C-245/92 P Chemie Linz v Commission [1999] ECR I-4643, paragraph 93).
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