S. R. Anderson, Tone: a linguistic survey, Tone features, 1978.

. Bao, Zhiming 1999 The Structure of Tone

R. Bergman, Vowel sandhi and word division in Igede, Journal of West African Languages, vol.8, pp.13-25, 1971.

. Igede, Ten Nigerian tone systems. Jos and Kano: Institute of Linguistics and Centre for the Study of Nigerian Languages, pp.43-50

M. Brunelle, Tone perception in Northern and Southern Vietnamese, Journal of Phonetics, vol.37, issue.1, pp.79-96, 2009.
DOI : 10.1016/j.wocn.2008.09.003

. Clements, Nick 1977 Four tones from three: the extra-high tone in Anlo Ewe

&. Der-houssikian and H. , Language and Linguistic Problems in Africa. Columbia (South Carolina): Hornbeam Press, Elements of Tone, Stress, and Intonation, pp.168-191, 1978.

L. M. Hyman, Register Tones and Tonal Geometry, 1993.
DOI : 10.1515/9783110869378.75

R. Jakobson, . Fant, &. Gunnar, and . Halle, Morris 1952 Preliminaries to Speech Analysis

Y. O. Laniran and . Clements, Downstep and high raising: interacting factors in Yoruba tone production, Journal of Phonetics, vol.31, issue.2, pp.203-250, 2003.
DOI : 10.1016/S0095-4470(02)00098-0
URL : https://hal.archives-ouvertes.fr/halshs-00180368

. Tibeto-burman-tonogenetics, Consonantal mutation and tonal split in the Tamang subfamily of Tibeto- Burman An historical argument against tone features, Proceedings of Congress of the Linguistic Society of America OCP Effects: Gemination and Antigemination Linguistic Inquiry 17, pp.1-123, 1978.

J. Mielke, The Emergence of Distinctive Features Odden, David 1986 On the role of the Obligatory Contour Principle in phonological theory, Do we need tone features? Clements et al, p.28, 2008.

P. Rose, Phonetics and phonology of Yang tone phonation types in Zhenhai, in: Cahiers de linguistique -Asie Orientale 18, pp.229-245, 1989.

H. Stahlke, Some problems with binary features for tone, International Journal of American Linguistics, vol.43, pp.1-10, 1977.