Case C-393/11: Order of the Court (Eighth Chamber) of 7 March 2013 (request for a preliminary ruling from the Consiglio di Stato — Italy) — Autorità per l’energia elettrica e il gas v Antonella Bertazzi and Others (Article 99 of the Rules of Procedure of the Court of Justice — Social policy — Directive 1999/70/EC — Framework agreement on fixed-term work concluded by ETUC, UNICE and CEEP — Clause 4 — Fixed-term employment contracts in the public sector — Stabilisation procedure — Recruitment of workers employed for a fixed term as career civil servants without a public competition — Determination of length of service — Complete disregard of periods of service completed under fixed-term employment contracts — Principle of non-discrimination)