• Berg, W. A. (1978). Aluminium and manganese toxicities in acid coal mine wastes. In: Environmental Management of Mineral Wastes (Ed. by G. T.Goodman and M. J.Chadwick), pp. 141150. Sijthoff and Noordhoff, The Netherlands .
  • Beckett, P. H. T. & Davis, R. D. (1978). The additivity of the toxic effects of copper, nickel and zinc in young barley. New Phytologist, 81, 155173.
  • Bould, C. (1955). Chelated iron compounds for the correction of lime-induced chlorosis. Nature, 175, 9091.
  • Clements, H. F. & Putman, E. W. (1971). Soil toxicities in Hawaiian soils. In: Recent Advances in Plant Nutrition, vol. II (Ed. by R. M.Samish), pp. 535546. Gordon and Breach, New York .
  • Coughtley, P. J. & Martin, M. H. (1978). Tolerance of Holcus lanatus to lead, zinc and cadmium in factorial combination. New Phytologist, 81, 147154.
  • Craig, G. C. (1978). A method of measuring heavy metal tolerance in grasses. Transactions of the Rhodesia Scientific Association, 58, 916.
  • Crooke, W. M. (1954). Effect of nickel versenate on oat plants. Nature, 173, 403.
  • Dekock, P. C. (1956). Heavy metal toxicity and iron chlorosis. Annals of Botany, 20, 134141.
  • Gemmell, R. P. (1977). Colonization of Industrial Wasteland. Edward Arnold, London .
  • Hewitt, E. J. (1948). Experiments on iron metabolism in plants. I. Some effects of metal-induced iron deficiency. Long Ashton Research Station Annual Report, pp. 6680.
  • Hogan, G. D. & Rauser, W. E. (1979). Tolerance and toxicity of cobalt, copper, nickel and zinc in clones of Agrostis gigantea. New Phytologist, 83, 665670.
  • Hunter, J. G. & Vergnano, O. (1952). Nickel toxicity in plants. Annals of Applied Biology, 34, 279.
  • Jones, R. G., Sutcliffe, W. M. & Marshall, C. (1971). Physiological and biochemical basis for heavy metal tolerance in clones of Agrostis tenuis. In: Recent Advances in Plant Nutrition, vol. II (Ed. by R. M.Samish), pp. 572581. Gordon and Breach, New York .
  • Jowett, D. (1958). Populations of Agrostis spp. tolerant of heavy metals. Nature, 182, 816817.
  • Jowett, D. (1964). Population studies on lead tolerant Agrostis tenuis. Evolution, 18, 7084.
  • Macleod, L. B. & Jackson, L. P. (1967). Aluminium tolerance of two barley varieties in nutrient solution, peat and soil culture. Agronomy Journal, 59, 359363.
  • Martin, M. H. (1968). Conditions affecting the distribution of Mercurialis perennis L. in certain Cambridgeshire woodlands. Journal of Ecology, 56, 777793.
  • Mellor, C. P. & Malley, L. (1948). Order of stability of metal complexes. Nature, 156, 436.
  • Mcneilly, T. & Bradshaw, A. D. (1968). Evolutionary processes in populations of copper tolerant Agrostis tenuis, Sibth. Evolution, 22, 108118.
  • Mukherji, S. & Roy, B. K. (1977). Toxic effects of chromium on germinating seedlings and potato tuber slices. Biochemie und Physiologie Pflanzen, 171, 235238.
  • Polson, D. E. & Adams, M. W. (1970). Differential response of navy beans (Phaseolus vulgaris L.) to zinc. I. Differential growth and elemental composition at excessive zinc levels. Agronomy Journal, 62, 557560.
  • Pratt, P. F. (1966). Aluminium. In: Diagnostic Criteria for Plants and Soils (Ed. by H. D.Chapman), pp. 312. Division of Agricultural Science, University of California.
  • Smith, P. F. & Specht, A. W. (1953). Heavy metal accumulation by citrus roots. Botanical Gazette, 114, 426436.
  • Spencer, E. L. (1937). Frenching of tobacco and thallium toxicity. American Journal of Botany, 24, 1624.
  • Stewart, I. & Leonard, C. D. (1952). Chelates as a source of iron for plants growing in the field. Science, 116, 564.
  • Wilkins, D. A. (1957). A technique for the measurement of lead tolerance in plants. Nature, 180, 3738.
  • Wu, L. & Antonovics, J. (1975). Zinc and copper uptake by Agrostis stolonifera, tolerant to both zinc and copper. New Phytologist, 75, 231237.