Case C-52/09: Judgment of the Court (First Chamber) of 17 February 2011 (reference for a preliminary ruling from the Stockholms tingsrätt — Sweden) — Konkurrensverket v TeliaSonera AB (Preliminary ruling — Article 102 TFEU — Abuse of dominant position — Prices applied by telecommunications operator — ADSL input services — Broadband connection services to end users — Margin squeeze on competitors)