Reference Highlight: - Iron and Aluminum Variable Charge Minerals Paterson, E., Goodman, B. A., & Farmer, V. C. (1991). The Chemistry of Aluminium, Iron and Manganese Oxides in Acid Soils. Soil Acidity, 97–124. doi:10.1007/978-3-642-74442-6_5 The Chemistry of Aluminium, Iron and Manganese Oxides in Acid Soils | SpringerLink Contact info@egyptfruit.com for the full-text reference.