From the introduction: "In the following sections I will discuss the presence of the surface segments W, kw, Xw, ŋ, and nasalization, and the status of the phoneme /w/ in present-day Seri. I will also discuss other prominent aspects of Seri phonology, especially those features in which this analysis differs from that of Moser and Moser 1965."
Marlett, Stephen A.
"Aspects of Seri phonology,"
Work Papers of the Summer Institute of Linguistics, University of North Dakota Session: Vol. 22, Article 5.
Available at: https://commons.und.edu/sil-work-papers/vol22/iss1/5