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<referencetext xmlns="http://eprints.org/ep2/data/2.0">Ladefoged, P. Vowels and consonants: an introduction to the sounds of languages. Oxford: Blackwell, 2001;&#13;
Ladefoed, P. &amp; Maddieson, I. The sounds of the world's languages. Oxford: Blackwell, 2001;&#13;
Akhvlediani, G. Introduction to Phonetics, Tbilisi, 1999;&#13;
Jeiranishvili, Evg. Udi Language, Tbilisi, 1971</referencetext>
