1. Alexander V (1974) A synthesis of the IBP tundra biome study of nitrogen fixation. In: Holding AJ, Heal OW, MacLean SF, Flanagan PW (eds) Soil organisms and decomposition in tundra. Tundra Biome Steering Committee. Stockholm, pp 109?121
2. Allanson BR, Hart RC, Lutjeharms JRE (1981) Observations on the nitrients, chlorophyll and primary production of the Southern Ocean south of Africa. S Afr J Antarct Res 10/11:3?14
3. Allen SE, Northover MJ (1967) Soil types and nutrients on Signy Island. Philos Trans R Soc London, Ser B 252:179?185
4. Allen SE, Grimshaw HM, Parkinson JA, Quarmby C (1974) Chemical analysis of ecological materials. Blackwell, Oxford
5. Babb TA, Whitfield DWA (1977) Mineral nutrient cycling and limitation of plant growth in the Truelove Lowland eco system. In: Bliss LC (ed) Truelove Lowland, Devon Island, Canada: A high Arctic ecosystem. University of Alberta Press, Edmonton, Canada, pp 589?606