1. 3 A. Amberger , 1980 : Foliar application of micronutrients, uptake and incorporation into metabolism . In: M. M. El-Fouly (ed.), Proc. 2nd Workshop 'Micronutrients and Plant Nutrition', Mariut, Egypt, 1979, pp. 47-60. NRC, Cairo, Egypt.
2. 4 A. Amberger , 1991 : Importance of micronutrients for crop production under semiarid conditions of North Africa and Middle East . In: M. M. El-Fouly, and A. F. A. Fawzi (eds), Proc. 4th Micronutrients Workshop, February 1989, Amman, Jordan, pp. 5-30. NRC, Cairo, Egypt.