G. Amon, O. Aznar and D. Vollet, “Why Are Some French Farmers Sludge-Takers? Some Agronomic and Socioeconomic Explanations,” International Journal of Agricultural Resources, Governance and Ecology, Vol. 5, No. 2-3, 2006, pp. 289-308.
 F. M. G. Tack, M. G. Verloo, L. Vanmechelen and E. Van Ranst, “Baseline Concentration Levels of Trace Elements as a Function of Clay and Organic Carbon Contents in Soils in Flanders (Belgium),” The Science of the Total Environment, Vol. 201, No. 2, 1997, pp. 113-123.
 P. Planquart, G. Bonin, A. Prone and C. Massiani, “Distribution, Movement and Plant Availability of Trace Metals in Soils Amended with Sewage Sludge Compost: Application to Low Metal Loadings,” The Science of the Total Environment, Vol. 241, No. 1-3, 1999, pp. 161-179.
 R. A. Klassen, “Geological Factors Affecting the Distribution of Trace Metals in Glacial Sediments of Central Newfoundland,” Environmental Geology, Vol. 33, No. 2-3, 1998, pp. 154-169.
 D. Baize and T. Sterckeman, “Of the Necessity of Knowledge of the Natural Pedo-Geochemical Background Content in the Evaluation of the Contamination of Soils by Trace Elements,” The Science of the Total Environment, Vol. 264, No. 1-2, 2001, pp. 127-139.
 T. Sterckeman, F. Douay, D. Baize, H. Fourier, N. Proix and C. Schvartz, “Trace Elements in Soils Developed in Sedimentary Materials from Northern France,” Geoderma, Vol. 136, No. 3-4, 2006, pp. 912-929.
 I. Walter and G. Cuevas, “Chemical Fractionation of Heavy Metals in a Soil Amended with Repeated Sewage Sludge Application,” The Science of the Total Environment, Vol. 226, No. 2-3, 1999, pp. 113-119.
 M. O. Mbila, M. L. Thompson, J. S. C. Mbagwu and D. A. Laird, “Distribution and Movement of Sludge-Derived Trace Metals in Selected Nigerian Soils,” Journal of Environmental Quality, Vol. 30, No. 5, 2001, pp. 1667-1674.
 E. Steinnes, R. O. Allen, H. M. Petersen, J. P. Rambaek and P. Varskog, “Evidence of Large Scale Heavy-Metal Contamination of Natural Surface Soils in Norway from Long-Range Atmospheric Transport,” The Science of the Total Environment, Vol. 205, No. 2-3, 1997, pp. 255-266.
 L. Hernandez, A. Probst, J. L. Probst and E. Ulrich, “Heavy Metal Distribution in Some French Forest Soils: Evidence for Atmospheric Contamination,” The Science of the Total Environment, Vol. 312, No. 1-3, 2003, pp. 195219. http://dx.doi.org/10.1016/S0048-9697(03)00223-7
 O. Sukreeyapongse, P. E. Holm, B. W. Strobel, S. Panichsakpatana, J. Magid and H. C. B. Hansen, “PH-Dependent Release of Cadmium, Copper, and Lead from Natural and Sludge-Amended Soils,” Journal of Environmental Quality, Vol. 31, No. 6, 2002, pp. 1901-1909.
 J. Bang and D. Hesterberg, “Dissolution of Trace Element Contaminants from Two Coastal Plain Soils as Affected by pH,” Journal of Environmental Quality, Vol. 33, No. 3, 2004, pp. 891-901.
 M. C. Chuan, G. Y. Shu and J. C. Liu, “Solubility of Heavy Metals in a Comtaminated Soil: Effects of Redox Potential and pH,” Water, Air, and Soil Pollution, Vol. 90, No. 3-4, 1996, pp. 543-556.
 J. Caillaud, D. Proust and D. Righi, “Weathering Sequences of Rock-Forming Minerals in a Serpentinite: Influence of Microsystems on Clay Mineralogy,” Clays and Clay Minerals, Vol. 54, No. 1, 2006, pp. 87-100.
 D. Proust, J. Caillaud and C. Fontaine, “Clay Minerals in Early Amphibole Weathering: Trito Dioctahedral Sequence as a Function of Crystallization Sites in the Amphibole,” Clays and Clay Minerals, Vol. 54, No. 3, 2006, pp. 351-362.
 K. S. Camuti and P. T. McGuire, “Preparation of Polished thin Sections from Poorly Consolidated Regolith and Sediment Material,” Sedimentary Geology, Vol. 128, No. 1-2, 1999, pp. 171-178.
 D. L. Biddle, D. J. Chittleborough and R. W. Fitzpatrick, “An Algorithm to Model Mass Balances Quantitatively,” Computers and Geosciences, Vol. 24, No. 1, 1998, pp. 77-82.
 P. Baveye, M. B. McBride, D. Bouldin, T. D. Hinesly, M. S. A. Dahdoh and M. F. Abdel-sabour, “Mass Balance and Distribution of Sludge-Borne Trace Elements in a Silt Loam Soil Following Long-Term Applications of Sewage Sludge,” The Science of the Total Environment, Vol. 227, No. 1, 1999, pp. 13-28.
 B. Minasny, A. B. McBratney and S. Salvador-Blanes, “Quantitative Models for Pedogenesis—A Review,” Geoderma, Vol. 144, No. 1-2, 2008, pp. 140-157.
 P. O. Scokart, K. Meeus-Verdinne and R. De Borger, “Mobility of Heavy Metals in Polluted Soils near Zinc Smelters,” Water, Air, and Soil Pollution, Vol. 20, No. 4, 1983, pp. 451-463.
 F. Ayari, E. Srasra and M. Trabelsi-Ayadi, “Characterization of Bentonitic Clays and Their Use as Adsorbent,” Desalination, Vol. 185, No. 1-3, 2005, pp. 391-397.
 J. Srodon and D. K. McCarty, “Surface Area and Layer Charge of Smectite from CEC and EGME/H2O-Retention Measurements,” Clays and Clay Minerals, Vol. 56, No. 2, 2008, pp. 155-174.
 A. P. Ferris and W. B. Jepson, “The Exchange Capacities of Kaolinite and the Preparation of Homoionic Clays,” Journal of Colloid and Interface Science, Vol. 51, No. 2, 1975, pp. 245-259.
 J. Hizal and R. Apak, “Modeling of Copper (II) and Lead (II) Adsorption on Kaolinite-Based Clay Minerals Individually and in the Presence of Humic Acid,” Journal of Colloid and Interface Science, Vol. 295, No. 1, 2006, pp. 1-13. http://dx.doi.org/10.1016/j.jcis.2005.08.005