From the introduction: "This paper describes the most significant segmental morphophonemic processes in the verb stems of Lalana Chinantec (LC). This paper also deals with questions which might be raised concerning the original phonemic analysis (Rensch 1955:455-63)."
Mugele, Robert L.
"Lalana Chinantec y-. Why?,"
Work Papers of the Summer Institute of Linguistics, University of North Dakota Session: Vol. 20, Article 3.
Available at: https://commons.und.edu/sil-work-papers/vol20/iss1/3