Durie & Hajek (1994:?頁) Durie, M.; Hajek, J., A revised standard phonemic orthography for Australian English vowels, Australian Journal of Linguistics, 1994, 14 (1): 93–107, doi:10.1080/07268609408599503
Sadowsky et al. (2013:92頁) Sadowsky, Scott; Painequeo, Héctor; Salamanca, Gastón; Avelino, Heriberto, Mapudungun, Journal of the International Phonetic Association, 2013, 43 (1): 87–96 [2018-02-15], doi:10.1017/S0025100312000369, (原始内容存档于2018-11-06)
Iivonen & Harnud (2005:62, 66–67頁) Iivonen, Antti; Harnud, Huhe, Acoustical comparison of the monophthong systems in Finnish, Mongolian and Udmurt, Journal of the International Phonetic Association, 2005, 35 (1): 59–71, doi:10.1017/S002510030500191X
Olson (2004:235頁) Olson, Kenneth S., Mono(PDF), Journal of the International Phonetic Association, 2004, 34 (02): 233–238 [2018-02-15], doi:10.1017/S0025100304001744, (原始内容存档(PDF)于2019-06-20)
Jassem (2003:105頁)该资料将此音记作⟨ɨ⟩但可以从pag. 105的元音图看出这音比起[ɨ]更靠近[ɘ]。 Jassem, Wiktor, Polish, Journal of the International Phonetic Association, 2003, 33 (1): 103–107, doi:10.1017/S0025100303001191