Clay profiling : The classification of montmorillonites - Emmerich, Katja (Forschungszentrum Karlsruhe. Competence Center for Material Moisture. University of Karlsruhe) ; Wolters, Felicitas ; Kahr, Guenter (ETH Zürich. Institute of Geotechnical Engineering) ; Lagaly, Gerhard (University of Kiel. Institute of Inorganic Chemistry)