The 'Trough Effect': an Ultrasound Study. - Yolanda Vazquez-Alvarez; Nigel Hewlett (Phonetica, 2007)

Measuring lingual coarticulation from midsagittal tongue contours: Description and example calculations using English /t/ and /ɑ/. - Natalia Zharkova; Nigel Hewlett (J. Phonetics, 2009)