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2. Caracterı́sticas acústicas de la vibrante múltiple del español en habla espontánea;Blecua;Proceedings of the 1st congress of ‘‘experimental phonetics’’,1999
3. Influences on articulatory timing in consonant sequences;Byrd;Journal of Phonetics,1996
4. Spanish pronunciation in the Americas;Canfield,1981
5. Introduction to the phonological history of the Slavic languages;Carlton,1991