Ringen, Catherine O.; Heinämäki, Orvokki (1999). "Variation in Finnish Vowel Harmony: An OT Account". Natural Language & Linguistic Theory. 17 (2): 303–337. doi:10.1023/A:1006158818498. S2CID169988008.
Ringen, Catherine O.; Heinämäki, Orvokki (1999). "Variation in Finnish Vowel Harmony: An OT Account". Natural Language & Linguistic Theory. 17 (2): 303–337. doi:10.1023/A:1006158818498. S2CID169988008.