Biblio

Stevens, Kenneth N & Sheila E Blumstein. 1981. The search for invariant acoustic correlates of phonetic features. In , Perspectives on the study of speech. (Perspectives On The Study Of Speech). Hillsdale, {NJ}: Erlbaum.

Велчева, Боряна. 1980. Праславянски и старобългарски фонологически изменения. София: БАН.

Bhat, D. N. 1978. A General Study of Palatalization. In , Universals of Human Language, vol. 2. Phonology, 47–92. (Universals Of Human Language). Stanford, California: Stanford University Press.