1. The flap as a contour segment;Banner (Inouye);UCLA Working Papers in Phonetics,1989
2. Usarufa distinctive features and phonemes;Bee;Papers in New Guinea Linguistics,1965
3. A general study of palatalization;Bhat,1978
4. Outline of the phonology of the Gokana dialect of Ogoni;Brosnahan;Journal of West African Languages,1964
5. Multilevel conditioning of phoneme variants in Apinaye;Burgess;Linguistics,1968