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Ergonomics of human-system interaction - Part 20: Accessibility guidelines for information/communication technology (ICT) equipment and services (ISO 9241-20:2008); German version EN ISO 9241-20:2009
German title
Ergonomie der Mensch-System-Interaktion - Teil 20: Leitlinien für die Zugänglichkeit der Geräte und Dienste in der Informations- und Kommunikationstechnologie (ISO 9241-20:2008); Deutsche Fassung EN ISO 9241-20:2009