Before his untimely death in the early nineties, Irwin Firchow wrote a grammatical sketch of Rotokas. It was published in 1987 and is somewhat difficult to obtain. I make the full text available here with the permission of the editors of Language and Linguistics in Melanesia and his wife, Jackie Mansen.
Irwin Firchow (left)
David Akoitai (middle)
Caleb Karuruvate (right)
The Article
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Reference in BiBTeX Format
  author  = "Firchow, Irwin B.",
  year    = 1987,
  title   = "Form and Function of {R}otokas Words",
  journal = "Language and Linguistics in Melanesia",
  volume  = 15,
  pages   = "{5--111}"