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Altorfer, Andreas; Jossen, Stefan; Würmle, Othmar; Käsermann, Marie-Louise; Foppa, Nikolaus; Zimmermann, Heiner (2000). Measurement and meaning of head movements in everyday face-to-face communicative interaction. BEHAVIOR RESEARCH METHODS INSTRUMENTS & COMPUTERS, 32(1), pp. 17-32. Springer 10.3758/BF03200785
