1. Mapping the conditional probability of soil variables
2. A. K. Bregt, J. A. M. Janssen, J. S. VanDerGriendt, W. Andriesse, Alkasuma, D. L. Dent, and M.E.F. Van Mensvoort, 1993 . Optimum observation density for mapping acid sulphate soils in Conoco, Indonesia. Accuracy and costs . In: Selected papers of the Ho Chi Minh City symposium on acid sulphate soils. (), International Institute for Land Reclamation and Improvement Pub. 53, Wageningen, pp.19 -20 .
3. A world perspective on acid sulphate soils