1. Akaike, H. Information theory and an extension of the maximum likelihood principle. Second International Symposium on Information Theory. Edited by: Petrov, B. N. and Csaki, F. pp.267–281. Budapest, Hungary: Akademia Kiado.
2. A comparison of prediction methods for the creation of field-extent soil property maps
3. Bonham-Carter, G. F. 1994.Geographic Information Systems for Geoscientists: Modelling with GIS, 398Tarrytown, New York: Pergamon Press.
4. Improving the kriging of a soil variable using slope gradient as external drift