Grace E. Oh, Susan Guion-Anderson, Katsura Aoyama, James Emil Flege, Reiko Akahane-Yamada, Tsuneo Yamada. A one-year longitudinal study of English and Japanese vowel production by Japanese adults and children in an English-speaking setting. J. Phonetics, 39(2):156-167, 2011. [doi]
Abstract is missing.