1. Environment Agency in Japan. Japanese Environment Agency Notification of No. 13, 1973 (in Japanese).
2. CEN TC 292 Working Group 2. Compliance test for leaching of granular waste materials and sludges, tenth draft, 1994.
3. NEN 7341, Leaching characteristics of building and solid waste materials — leaching tests — determination of the availability of inorganic components for leaching. Draft 1993 (previously part of NVN 2508), Netherlands Normalisation Institute, the Netherlands, 1993.
4. Draft NVN 7348. Determination of reducing properties of materials, 1993.
5. Leaching characteristics of construction materials and stabilization products containing waste materials;van der Sloot,1987