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- [37] INFLUENCE OF ORGANIC FORMS OF COPPER, MANGANESE AND IRON ON BIOACCUMULATION OF THESE METALS AND ZINC IN LAYING HENS JOURNAL OF ELEMENTOLOGY, 2008, 13 (03): : 309 - 319
- [38] Simultaneous extraction of copper, zinc, iron and manganese in the soil of the loessic high pampas of Cordoba, Argentina AGROCHIMICA, 2002, 46 (06): : 241 - 252