free variation of phonemes

Sources

• TRASK 1996 150 (#2)

  TRASK, R. L. (1996) A Dictionary of Phonetics and Phonology. London: Routledge. 

• ONISHI 1981 206

  ONISHI, Masao. (1981) A Grand Dictionary of Phonetics. Tokyo: The Phonetic Society of Japan. 

• SWADESH 1935 118-119

  SWADESH, Morris. (1935) "The Phonemic Principle", in Language, Vol.10, 117-129.