Yuzawa Nobuo, Joto Akiyo. The Intelligibility Level and Acoustic Features of the English Rising Tone Produced by Japanese Learners (副会長:畑中孝實教授:御園和夫教授:八木克正教授"定年退職記念論文集" 日本英語音声学会第16回全国大会兼第2回国際英語音声学者会議(高知大学)開催記念論文集). 英語音声学 : 学術論文集. 2012. 16. 101-112
The Intelligibility of the English Vowel /^/ Produced by Native Speakers of Japanese and its Relations to the Acoustic Characteristics
(9th Annual Conference of the International Speech Communication Association 2008)
Intelligibility of English Consonants Pronounced by Japanese Learners
(15th World Congress of Applied Linguistics 2008)