Phonological acquisition 論文集所収 Mitsuhiko Ota ·2006-08-31 ·『Cambridge University Press eBooks』 pp. 41-47 doi:10.1017/cbo9780511758652.008
An Acoustic Study of the Japanese Short and Long Vowel Distinction 学位論文 Sanae Akaba ·2008-08-18 ·University of Kansas hdl.handle.net