1. Mattingly, G. E. G., Effects of radioactive phosphate fertilizers on yield and phosphorus uptake by ryegrass in pot experiments on calcareous soils from Rothamsted. J. Agr. Sci.49, 160?168 (1957).
2. Mattingly, G. E. G. and Talibudeen, O., Isotopic Exchange of phosphates in Soils. Rep. Rothamsted Exp. Sta.1960, 246?265 (1961).
3. Mattingly, G. E. G. and Talibudeen, O., The effects of ammonium sulphate and sodium nitrate on solubility of soil phosphate. Rep. Rothamsted Exp. Sta.1961, 53?54 (1962).
4. Talibudeen, O., Isotopically Exchangeable Phosphorus in Soils, Part III. J. Soil Sci.9, 120?129 (1958).
5. Vaidyanathan, L. V., A study of the inorganic soil phosphate by the use of mixed cation-anion exchange resins and its relation to the isotopically exchangeable phosphate in the soil. Ph.D. Thesis, London (1961).