Case C-66/14: Judgment of the Court (Fourth Chamber) of 6 October 2015 (request for a preliminary ruling from the Verwaltungsgerichtshof — Austria) — Finanzamt Linz v Bundesfinanzgericht, Außenstelle Linz (Reference for a preliminary ruling — Articles 49 TFEU, 54 TFEU, 107 TFEU and 108(3) TFEU — Freedom of establishment — State aid — Taxation of groups of companies — Acquisition of a holding in a subsidiary — Depreciation of the goodwill — Limitation on holdings in resident companies)