1. Saxon University of Cooperative Education, Glauchau, Germany
2. University for Sustainable Development, Eberswalde, Germany
3. Institute for Machine Tools, Universität Stuttgart, Stuttgart, Germany
4. Saxon University of Cooperative Education, Academy of Studies Dresden, Dresden, Germany
5. Institute for Ceramics, Fire Resistant and Composite Materials, TU Bergakademie Freiberg, Freiberg, Germany
6. Institute for Construction Materials, ETH Zürich, Zürich, Switzerland
7. Luleå University of Technology, Luleå, Sweden