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POVOLNÁ, Renata. Some means of politeness in English face-to-face conversation. Topics in Linguistics. Politeness and Interaction. Vol. 1. Nitra: Constantine the Philosopher University, 2007, roč. 1, č. 1, s. 153-163. ISSN 1802-128X.Podrobněji: https://is.muni.cz/publication/745248/cs