Martin J A R,Arias M L,Corbi J M G.Heavy metals contents inagricultural topsoils in the Ebro basin(Spain).Application of themultivariate geostatistical methods to study spatial variations[J]. Environmental Pollution,2006,144(3):1001-1021.
[15]
Nicholson F A,Smith S R,Alloway B J,et al.An inventory ofheavy metals inputs to agricultural soils in England and Wales[J].The Science of the Total Environment,2003,311(1-3):205-219.
Jervase A J,LawatiA A,Dorvlo A S.Contour maps for sunshineratio for Oman using radial basis function generated data[J].RenewableEnergy,2003,28(3):487-497.
