• Cox, R. M., & Thurmah, D. A. (1978). Inhibition by zinc of soluble and cell-wall acid phosphatases of zinc-tolerant and non-tolerant clones of Anthoxanthum odoratum. New Phytologist, 80, 1722.
  • Hoagland, D. R., & Arnon, D. I. (1950). The Water-Culture Method for Growing Plants without Sail. Californian Agricultural Station Circular No. 347.
  • Johnston, W. R. (1976). Studies in the plant ecology of two Scottish serpentine areas. M.Sc. thesis, University of Stirling.
  • Johnston, W.R. (1979). Biochemical and physiological studies on races of Festuca rubra L. from a serpentine and non-serpentine soil. Ph.D. thesis, University of Stirling.
  • Johnston, W. R., & Proctor, J. (1980). Ecological studies on Meikle Kilrannoch serpentines. Transactions of the Botanical Society of Edinburgh 43, 207215.
  • Johnston, W. R., & Proctor, J. (1981). Growth of serpentine and non-serpentine races of Festuca rubra in solutions simulating the chemical conditions in a toxic serpentine soil. Journal of Ecology 69, 855869.
  • Martin, J. K. (1972). The influence of rhizosphere microflora on the availability of 32P-myoinositol hexaphosphate phosphorus to wheat. Soil Biology and Biochemistry 5, 473483.
  • Proctor, J. (1971). The plant ecology of serpentine III. The influence of a high Mg/Ca ratio and high nickel and chromium levels in some British and Swedish serpentine soils. Journal of Ecology 59, 827842.
  • Proctor, J., & Woodell, S. R. J. (1975). The ecology of serpentine soils. Advances in Ecological Research, 9, 255366.
  • Ridge, E. H., & Rovira, A. D. (1971). Phosphatase activity of intact young wheat roots under sterile and non-sterile conditions. New Phytologist, 70, T 10171026.
  • Wainwright, S. J., & Woolhouse, H. W. (1975). Physiological mechanisms of heavy metal tolerance in plants. In: The Ecology of Resource Degradation and Renewal (Ed. by M. J.Chadwick and G. T.Goodman), pp. 231257. Symposium of the British Ecological Society, vol. 15. Blackwell Scientific Publications, Oxford .
  • Willett, I. R., & Batey, T. (1977). The effects of metal ions on the root surface phosphatase activity of grasses differing in tolerance to serpentine soil. Plant and Soil 48, 213221.
  • Woolhouse, H. W. (1969). Differences in the properties of the acid phosphatases of plant roots and their significance in the evolution of edaphic ecotypes. In: Ecological Aspects of the Mineral Nutrition of Plants (Ed. by I. H.Rorison), pp. 357380. Blackwell Scientific Publications, Oxford .