1. Universal principles underlying segmental structures in parrot song and human speech
2. ORIGIN OF LANGUAGE
3. http://www.cochlea.org/en/hear/human-auditory-range http://www.cochlea.org/en/hear/human-auditory-range
4. Roberta Cubelli . 1991 , A selective deficit for writing vowels in acquired dysgraphia. Nature volume 353 , pages 258– 260 . Roberta Cubelli. 1991, A selective deficit for writing vowels in acquired dysgraphia. Nature volume 353, pages 258–260.
5. Alfonso Caramazza , 200 0 , Separable processing of consonants and vowels.Nature volume 403 , pages 428– 430 . Alfonso Caramazza, 2000, Separable processing of consonants and vowels.Nature volume 403, pages 428–430.