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Castick, S., Knight, R.-A. and Sell, D. (2017). Perceptual judgements of resonance, nasal airflow, understandability and acceptability in speakers with cleft palate: ordinal versus visual analogue scaling. The Cleft Palate-Craniofacial Journal, 54(1), pp. 19-31. doi: 10.1597/15-164