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Gao, S. (1992). Systems evolution: the conceptual framework and a formal model. (Unpublished Doctoral thesis, City University London)
He, R. (1992). Family networks and life in Southeastern China. (Unpublished Doctoral thesis, City University London)
Midgley, G.R. (1992). Unity and pluralism. (Unpublished Doctoral thesis, City University London)