A Quantitative Evaluation of Hypernasality in Children. Using the slope of spectrum envelope. 論文 Sawako Hirai・Keiko Okazaki・Takayuki Arai ·1994-01-01 ·『The Japan Journal of Logopedics and Phoniatrics』 35(2) pp. 199-206 doi:10.5112/jjlp.35.199