1. Allaway W H 1986 Soilplantanimal and human interrelationships in trace element nutrition. In Trace elements in human and animal nutrition. Ed. W Mertz. 5th Edition. pp 465–488. Academic Press, Orlando, San Diego, New York, Austin, London, Montreal, Sydney, Tokyo, Toronto.
2. Anonymous 1988 The Surgeon General’s Report on Nutrition and Health. 1988. DHHS (PHS) Pub. No. 8850210. U.S. Government Printing Office, Washington, D.C. 727 p.
3. Arnold J M, Bauman L F and Aycock H S 1977 Interrelations among protein, lysine, oil, certain mineral element concentrations, and physical kernel characteristics in two maize populations. Crop Sci. 17, 421–425.
4. Benton-Jones J Jr. 1991 Plant tissue analysis in micronutrients. In Micronutrients in Agriculture. Eds. J J Mortvedt, F R Cox, L M Shuman and R M Welch. 2nd Edition. pp 477–521. Soil Science Society of America, Madison, WI.
5. Bremner I 1970 The nature of trace element binding in herbage and gut contents. In Trace Element Metabolism in Animals. Ed. C F Mills. pp 366–369. E. & S. Livingston Pub., Edinburgh, London.