Analysis of information sources in references of the Wikipedia article "Voiceless retroflex fricative" in English language version.
This sound can be transcribed also ṣ̌ʳ, the sound should be similar to Czech voiceless ř (Burki 2001), phonetically [ɻ̝̊]: voiceless retroflex non-sibilant fricative. Similar sound but voiced occurs also in the Nūristānī languages
...and ř for the peculiar voiceless fricativized trill that occurs in the Kaniguram dialect.... In the original work, Efimov followed Morgenstierne in using ṣ̌ʳ to represent this sound, which has been replaced here with the typographically simpler ṛ̌.
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