1. ROCKWOOL International A/S, 2640 Hedehusene, Denmark
2. Institute of Experimental Mineralogy RAS, 142432 Chernogolovka, Russia
3. Haldor Topsoe A/S, Haldor Topsøes Alle 1, 2800 Kongens Lyngby, Denmark
4. Institute of Non-Metallic Materials, Clausthal University of Technology, 38678 Clausthal-Zellerfeld, Germany
5. Department of Physics, Danish Technical University, 2800 Kongens Lyngby, Denmark