Uses a number series to indicate references; bibliographies list these in numerical order as they appear in the text
1. Adams, A.B. (1983) Article title: subtitle. Journal Title 46 (Suppl. 2), 617-619.
2. Lessells, D.E. (1989) Chapter title. In: Arnold, J.R. & Davies, G.H.B. (eds.) Book Title, 3rd edn. Blackwell Scientific Publications, Oxford, pp. 32-68.
3. Bennett, W.P., Hoskins, M.A., Brady, F.P. et al. (1993) Article title. Journal Title 334, 31-35.
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