1. British Standard (ISO 1999)
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4. Dickinson, A., Eisma, R., Syme, A., Gregor, P.: UTOPIA,: Usable Technology for Older People: Inclusive and Appropriate. In: Brewster, S., Zajicek, M. (eds.) A New Research Agenda for Older Adults, Proc. BCS HCI, London, pp. 38–39 (2002)
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