Cloran, Carmel. 1994. Rhetorical units and decontextualisation: En enquiry into some relations of context, meaning and grammar. (Monographs in Systemic Linguistics 6). Nottingham: University of Nottingham.
Gibson, Tim R. 1993. Towards a discourse theory of abstracts and abstracting. Two volumes. (Monographs in Systemic Linguistics 5). Nottingham: Dept. of English Studies.