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KOPEČEK, Ivan. Optimal Structures of Speech Menus in Speech Based Hypertexts and Dialogue Systems. In Proceedings of 10th Intenational Conference Speech and Computer. Patras: University of Patras, 2005, s. 719-722. ISBN 5-7452-0110-x.Podrobněji: https://is.muni.cz/publication/595704/cs