19In relation to the freedom of movement for workers, the principle of non-discrimination was implemented by Article 39 EC as well as by secondary legislation, inter alia Council Regulation (EEC) No 1612/68 of 15 October 1968 on freedom of movement for workers within the Community (OJ, English Special Edition 1968 (II), p. 475) (see, inter alia, Commission v Greece, paragraph 12; Gilly, paragraph 38; Case C-138/02 Collins [2004] ECR I-2703, paragraph 55; and Schulz-Delzers and Schulz, paragraph 29 and case-law cited).
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