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2. Exchange of Zn, Mn, Cu and Fe in relation to saturation of the soil complex;Cottenie,1972
3. Biological and analytical aspects of soil pollution;Cottenie,1982
4. Organic matter reactions involving micronutrients in soils;Stevenson,1972
5. Principal problems of the use of city wastes for crop production and soil conservation;Tietjen;F.A.O. Soils Bull.,1975