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WikiPedia: Âm_xát_môi-môi_hữu_thanh http://www-01.sil.org/pacific/png/pubs/92847454868... http://www.kfs.oeaw.ac.at/publications/habil_2007m... http://www.antoninurubattu.it/rubattu/grammatica-s... https://web.archive.org/web/20141126205921/http://... http://www.eric.com.br/turkish-grammar/turkish-gra... http://gep.ruhosting.nl/carlos/gussenhoven_aarts.p... https://books.google.com/?id=PBqPPLE2iXEC http://escholarship.org/uc/item/8k45g432 https://www.academia.edu/11365507/Castilian_Spanis... https://books.google.es/books/about/Fon%C3%A9tica_...