1. Organic carbon;Allison,1965
2. Disaggregation and clay dispersion of Oxisols: Na-resin, a recommended methodology;Bartoli;Geoderma,1991
3. Methods for Chemical Analysis of Soils. NZ Soil Bureau. Scientific Report 80;Blakemore,1981
4. Towards Understanding Mineralogy. II. Notes on Ferrihydrite;Childs,1985
5. The nature, properties and management of volcanic soils;Dahlgren;Adv. Agron.,2004