• Douglas AE. 1998. Host benefit and the evolution of specialisation in symbiosis. Heredity 81: 599603.
  • Farley RA, Fitter AH. 1999. The responses of seven co-occuring woodland herbaceous perennials to localised nutrient-rich patches. Journal of Ecology 87: 849959.
  • Jakobsen I, Smith SE, Smith FA. 2002. Function and diversity of arbuscular mycorrhizae in carbon and mineral nutrition. In: Van der HeijdenMGA, SandersIR, eds. Mycorrhizal ecology. Berlin, Heidelberg, Germany: Springer, 157: 75–92.
  • Law R, Lewis DH. 1983. Biotic environments and the maintenance of sex- some evidence from mutualistic symbioses. Biological Journal of the Linnean Society 20: 249276.
  • Robinson D. 1994. The responses of plants to non-uniform supplies of nutrients. New Phytologist 127: 635674.
  • Sanders FE, Mosse B, Tinker PB. 1975. Endomycorrhizas. London, UK: Academic Press.