Judgment of the Court (Sixth Chamber) of 13 November 1990 in Case C-106/89 (reference for a preliminary ruling by the Juzgado de Primera Instancia e Instruccidn No 1, Oviedo (Spain): Marleasing SA v. La Comercial Internacional de Alimentaci6n SA (Directive 68/151/EEC — Article 11 — Interpretation in conformity with national law)