Case C-399/09: Judgment of the Court (Fourth Chamber) of 22 June 2011 (reference for a preliminary ruling from the Nejvyšší správní soud (Czech Republic)) — Marie Landtová v Česká správa socialního zabezpečení (Freedom of movement for workers — Social security — Agreement on social security entered into by two Member States before accession to the European Union — Member State competent to determine the value of completed periods of insurance — Old-age pension — Supplementary benefit paid solely to nationals and residents of a Member State)