1. Institute of Agricultural Engineering, University of Bonn, Nussallee 5, D-53115 Bonn, Germany
2. Department of Chemistry, Energetic Materials Research, Ludwig-Maximilians University of Munich, Butenandtstr. 5−13 (Haus D), D-81377 Munich, Germany
3. HyperChrom SA, 121 Avenue de la Faiencerie, Luxembourg, Luxembourg 1511