Case C-44/08: Judgment of the Court (Fourth Chamber) of 10 September 2009 (reference for a preliminary ruling from the Korkein oikeus (Finland)) — Akavan Erityisalojen Keskusliitto AEK ry and Others v Fujitsu Siemens Computers Oy (Preliminary ruling procedure — Directive 98/59/EC — Approximation of the laws of the Member States relating to collective redundancies — Article 2 — Protection of workers — Informing and consulting with workers — Group of undertakings — Parent company — Subsidiary)