Learning Phonemic Vowel Length from Naturalistic Recordings of Japanese Infant-Directed Speech 論文 Ricardo A. H. Bion・Kouki Miyazawa・Hideaki Kikuchi・Reiko Mazuka ·2013-02-20 ·『PLoS ONE』 8(2) pp. e51594-e51594 doi:10.1371/journal.pone.0051594