Timothy Usher, Santa Fe Institute
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Geurtjens (1933: 398-433) 447 comparative terms for Jeïsch
Boelaars (1950: …) …
Drabbe (1954: 26-35) grammar sketch and (pp. 53-68) 413 comparative terms for Jéi
Voorhoeve (1975: 94) 40 comparative terms for Yey after Drabbe (1954)
Donohue (1996: 18-50) 159 comparative terms for Poo village
Sohn, Lebold and Kriens (2009: 31-42) 200 comparative terms for Yei of Poo village
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