Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Jianjing Kuang,The Tonal Space of Contrastive Five Level Tones,Phonetica,0031-8388,Walter de Gruyter GmbH,2013-10-01,70,1-2,1-23,https://cir.nii.ac.jp/crid/1363107369469232640,https://doi.org/10.1159/000353853