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- Français: Circulaire NBB_2015_21 / Circulaire concernant le contrôle interne et la fonction d’audit interne
- Nederlands: Circulaire NBB_2015_21 / Circulaire betreffende de interne controle en de interne auditfunctie
- English: Circular NBB_2015_21 / Circular concerning the internal control system and the internal audit function