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Markéta Straňáková-Lopatková, Ivan Kopeček, Karel Pala (2001): Ambiguity Problems in Human-Computer Interaction. In: Proceedings of the conference UAHCI, vol.3 (ed. C. Stephanidis), LEAmahwah, New Jersey, ISBN 0-8058-3609-8, pp.486-490 (bibtex)