/χ/ can also be heard as allophones [h] or [x], occurring in free variation.
/ɻ/ can be heard as a voiced fricative [ʐ] within the onset of a stressed syllable, or of a word-initial syllable. It can also be heard as a flap sound [ɾ] intervocalically in the onset of an unstressed syllable. In a syllable-coda position, it is heard as a rhotic [ə˞] vowel sound.
/j/ can have a spirantized allophone of [ʝ] strongly in stressed syllables.[3]
Numerals
Mongolian numerals such as the following[4] are only in use in the Mongghul dialect, while Mangghuer speakers have switched to counting in Chinese.[4] Note that while the Mongolian script has only arban for 'ten', Middle Mongolian *harpa/n including *h can be reconstructed from the scripts.[5]
Dpal-ldan-bkra-shis, Keith Slater, et al. (1996): Language Materials of China’s Monguor Minority: Huzhu Mongghul and Minhe Mangghuer. Sino-Platonic papers no. 69.
Georg, Stefan (2003): Mongghul. In: Janhunen, Juha (ed.) (2003): The Mongolic languages. London: Routledge: 286-306.
Slater, Keith W. (2003): A grammar of Mangghuer: A Mongolic language of China's Qinghai-Gansu sprachbund. London/New York: RoutledgeCurzon.
Svantesson, Jan-Olof, Anna Tsendina, Anastasia Karlsson, Vivan Franzén (2005): The Phonology of Mongolian. New York: Oxford University Press.
Zhàonàsītú 照那斯图 (1981): Tǔzúyǔ jiǎnzhì 土族语简志 (Introduction to the Tu language). Běijīng 北京: Mínzú chūbǎnshè 民族出版社.
Mostaert, A.; de Shmedt, A. (1930). "Le Dialecte Monguor parlé par les Mongols du Kansu Occidental. Iére Partie: Phonétique. (Suite)". Anthropos. 25 (3/4): 657–669. JSTOR40445863.
Mostaert, A.; de Smedt, A. (1929). "Le Dialecte Monguor parlé par les Mongols du Kansu Occidental. Iére Partie: Phonétique. (Suite)". Anthropos. 24 (5/6): 801–815. JSTOR40445976.