Judgment of the Court (First Chamber) of 10 March 2005 in Case C-196/02 (reference for a preliminary ruling from the Irinodikio Athinon): Vasiliki Nikoloudi v Organismos Tilepikinonion Ellados AE (Social policy — Male and female workers — Article 119 of the EC Treaty (Articles 117 to 120 of the EC Treaty have been replaced by Articles 136 EC to 143 EC) — Directive 75/117/EEC — Equal pay — Directive 76/207/EEC — Equal treatment — Temporary part-time posts — Exclusion from appointment as an established member of staff — Calculation of length of service — Burden of proof)