Retroflexes, Utrecht, 2003, ISBN 90-76864-39-X Helgason, Pétur, On-line preaspiration in Swedish: implications for historical sound change, Proceedings of
/j/的确切表示,< i >可代表/i, j/,< u >可代表/u, w/;但实际上/j/和/w/并不常见。 送气辅音在元音之间将会出现前送气化(英语:Preaspiration)。不送气辅音在鼻音后将会浊化。 普雷佩查字母表(P’URHEPECHA JIMBO KARARAKUECHA): a b ch ch'
Publishing Group. 1998: 297 [2014-04-24]. ISBN 978-0313288531. Roos, Marti. Preaspiration in Western Yugur monosyllables. Johanson, Lars (编). The Mainz Meeting: