Read about it in this source[1]: 119–120 . Found some citations, such as Klaiman (1988) 'affectedness and control: A typology of voice systems' and Haspelmath (1990) 'The grammaticization [sic] of passive morphology'.
- ^ Onishi, Masayuki (2000). "Transitivity and valency-changing derivations in Motuna". In Dixon, R.M.W. & Aikhenvald, Alexendra Y. Changing Valency: Case Studies in Transitivity. Cambridge University Press.