1. Hohberg I, Müller Ch, Schießl P, Volland G. Sachstandsbericht “Umweltverträglichkeit zementgebundener Baustoffe”. In: Schriftenreihe des Deutschen Ausschusses für Stahlbeton, nr. 458, 1996.
2. Groot GJ de, Hohberg I, Lamers FJM, Veen AMH van der, Wassing W. Development of a leaching protocol for the determination of the environmental quality of concrete. MAT1 CT93-0026, final report, March 1997.
3. NEN 7341 02.95. Leaching characteristics of solid earthy and stony building and waste materials. Leaching tests. Determination of the leaching availability of inorganic compounds.
4. DIN 38 414 Teil 4. Deutsche Einheitsverfahren zur Wasser-, Abwasser- und Schlammuntersuchung; Schlamm und Sedimente (Gruppe S).
5. NEN 7345 03.95. Leaching characteristics of solid earthy and stony building and waste materials. Leaching tests. Determination of the leaching behaviour of inorganic components from building monolithic waste materials with the diffusion test.