• Barber, D. A. (1967). The effect of micro-organisms on the absorption of inorganic nutrients by intact plants. I. Apparatus and culture technique. J. exp. Bot., 18, 163.
  • Barber, D. A. & Frankenburg, U. C. (1971). The contribution of micro-organisms to the apparent absorption of ions by roots grown under non-sterile conditions. New Phytol., 70, 1027.
  • Edwards, D. G. (1968). The mechanism of phosphate absorption by plant roots. Trans, 9th int. Congr. Soil Sci., 2, 183.
  • Edwards, D. G. (1970). Phosphate absorption and long-distance transport in wheat seedlings. Aust. J. biol. Sci., 23, 255.
  • Epstein, E. (1966). Dual patterns of ion absorption by plant cells and by plants. Nature, Land., 212, 1324.
  • Kannan, S. (1971). Kinetics of iron absorption by excised rice roots. Planta, 96, 262.
  • Laties, G. G. (1969). Dual mechanisms of salt uptake in relation to compartmentation and long-distance transport. A. Rev. Pl. Physiol, 20, 89.
  • Macdonald, I. R., Bacon, J. S. D., Vaughan, D. & Ellis, R. J. (1966). The relation between ion absorption and protein synthesis in beet discs, J. exp. Bot., 17, 822.
  • Osmund, C. B. & Laties, G. G. (1968). Interpretation of dual isotherm for ion absorption in beet tissue. Pl. Physiol, Lancaster, 43, 747.
  • Pitman, M. G., Mertz, S. M., Jr., Graves, J. S., Pierce, W. S. & Higinbotham, N. (1971). Electrical potential differences in cells of barley roots and their relation to ion uptake. Pl. Physiol, Lancaster, 47, 76.
  • Rains, D. W. & Epstein, E. (1967). Preferential absorption of potassium by leaf tissue of the mangrove, Avicennia marina: an aspect of halophytic competence in coping with salt. Aust. J. biol. Sci., 20, 847.
  • Shone, M. G. T. (1969). Origins of the electrical potential difference between the xylem sap of maize roots and the external solution, J. exp. Bot., 20, 698.
  • Spanswick, R. M. (1970). Electrophysiological techniques and the magnitudes of the membrane potentials and resistances of Nitella transhtcens. J. exp. Bot., 21, 617.
  • Welch, R. M. & Epstein, E. (1968). The dual mechanism of alkali cation absorption by plant cells: their parallel operation across the plasmalemma. Proc. natn. Acad. Sci. U.S.A., 61, 447.
  • Welch, R. M. & Epstein, E. (1969). The plasmalemma: site of the type 2 mechanisms of ion absorption. Pl. Physiol, Lancaster, 44, 301.