5S. Rapant,J. Kordík.An environmental risk assessment map of the Slovak Republic: application of data from geochemical atlases[J]. Environmental Geology . 2003 (4)
6E.E Chang,P.C Chiang,P.H Lu,Y.W Ko.Comparisons of metal leachability for various wastes by extraction and leaching methods[J]. Chemosphere . 2001 (1)