1. Abdulla, I., Plant and soil studies on the effect of some synthetic chelating agent on certain mineral and organic constituents of plants. Ph.D. thesis, University of London (1962).
2. Biddulph, O., The translocation of minerals in plants. Mineral Nutrition of Plants. The Univ. of Wisc. Press. Madison, 261 (1951).
3. Brown, J. C., Tiffin, L. O. and Holmes, R. S., Internal inactivation of iron in Soybeans as affected by root growth medium. Soil Sci.87, 89 (1959).
4. Heck, W. E. and Bailey, L. F., Chelation of trace metals in nutrient solutions. Plant Physiol.25, 573 (1950).
5. Higdon, R. J., Pear trees chlorosis with special reference to its correction with chelated metals. Proc. Am. Soc. Hort. Sci.69, 101 (1957).