1. An Introduction to Multivariate Statistical Analysis;Anderson,2003
2. The GlobalSoilMap project specifications;Arrouays,2014
3. k-means++: the advantages of careful seeding;Arthur,2007
4. Soil survey and soil classification of the Koupendri catchment in Benin, West Africa;Azuka;Afr. J. Agric. Res.,2015
5. Land Qualities in Space and Time;Bouma,1989