1. Hazardous Waste Directive (91/689/EEC).
2. Handreiking Classificatie van (verontreinigde) grond in het kader van Eural (in Dutch),2002
3. Interpretation of the Definition and Classification of Hazardous Waste;Technical Guidance WM2,2005
4. Characterization of Waste. Digestion for Subsequent Determination of Aqua Regia Soluble Portion of Elements;EN 13657,2002
5. Characterization of Waste – Leaching Behaviour Tests – Influence of pH on Leaching with Initial Acid/Base Addition;CEN/TS 14429,2005