Downstep and high raising: interacting factors in Yoruba tone production. - Yetunde O. Laniran; George N. Clements (J. Phonetics, 2003)

Quantal phonetics and distinctive features. - George N. Clements; Rachid Ridouane (ExLing, 2006)

Distinctive feature enhancement: a review. - George N. Clements; Rachid Ridouane (ExLing, 2006)

"Phonetic bases of distinctive features": Introduction. - George N. Clements; Pierre A. Hallé (J. Phonetics, 2010)